| <!DOCTYPE html> |
| |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8"/> |
| <meta content="IE=edge" http-equiv="X-UA-Compatible"/> |
| <meta content="width=device-width, initial-scale=1" name="viewport"/> |
| <title>mxnet.gluon.block — mxnet documentation</title> |
| <link crossorigin="anonymous" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" rel="stylesheet"/> |
| <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet"/> |
| <link href="../../../_static/basic.css" rel="stylesheet" type="text/css"> |
| <link href="../../../_static/pygments.css" rel="stylesheet" type="text/css"> |
| <link href="../../../_static/mxnet.css" rel="stylesheet" type="text/css"/> |
| <script type="text/javascript"> |
| var DOCUMENTATION_OPTIONS = { |
| URL_ROOT: '../../../', |
| VERSION: '', |
| COLLAPSE_INDEX: false, |
| FILE_SUFFIX: '.html', |
| HAS_SOURCE: true, |
| SOURCELINK_SUFFIX: '' |
| }; |
| </script> |
| <script src="https://code.jquery.com/jquery-1.11.1.min.js" type="text/javascript"></script> |
| <script src="../../../_static/underscore.js" type="text/javascript"></script> |
| <script src="../../../_static/searchtools_custom.js" type="text/javascript"></script> |
| <script src="../../../_static/doctools.js" type="text/javascript"></script> |
| <script src="../../../_static/selectlang.js" type="text/javascript"></script> |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script> |
| <script type="text/javascript"> jQuery(function() { Search.loadIndex("/searchindex.js"); Search.init();}); </script> |
| <script> |
| (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ |
| (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new |
| Date();a=s.createElement(o), |
| m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) |
| })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); |
| |
| ga('create', 'UA-96378503-1', 'auto'); |
| ga('send', 'pageview'); |
| |
| </script> |
| <!-- --> |
| <!-- <script type="text/javascript" src="../../../_static/jquery.js"></script> --> |
| <!-- --> |
| <!-- <script type="text/javascript" src="../../../_static/underscore.js"></script> --> |
| <!-- --> |
| <!-- <script type="text/javascript" src="../../../_static/doctools.js"></script> --> |
| <!-- --> |
| <!-- <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> --> |
| <!-- --> |
| <link href="../../index.html" rel="up" title="Module code"> |
| <link href="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/mxnet-icon.png" rel="icon" type="image/png"/> |
| </link></link></link></head> |
| <body background="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/mxnet-background-compressed.jpeg" role="document"> |
| <div class="content-block"><div class="navbar navbar-fixed-top"> |
| <div class="container" id="navContainer"> |
| <div class="innder" id="header-inner"> |
| <h1 id="logo-wrap"> |
| <a href="../../../" id="logo"><img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/mxnet_logo.png"/></a> |
| </h1> |
| <nav class="nav-bar" id="main-nav"> |
| <a class="main-nav-link" href="../../../install/index.html">Install</a> |
| <span id="dropdown-menu-position-anchor"> |
| <a aria-expanded="true" aria-haspopup="true" class="main-nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button">Gluon <span class="caret"></span></a> |
| <ul class="dropdown-menu navbar-menu" id="package-dropdown-menu"> |
| <li><a class="main-nav-link" href="../../../gluon/index.html">About</a></li> |
| <li><a class="main-nav-link" href="http://gluon.mxnet.io">Tutorials</a></li> |
| </ul> |
| </span> |
| <span id="dropdown-menu-position-anchor"> |
| <a aria-expanded="true" aria-haspopup="true" class="main-nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button">API <span class="caret"></span></a> |
| <ul class="dropdown-menu navbar-menu" id="package-dropdown-menu"> |
| <li><a class="main-nav-link" href="../../../api/python/index.html">Python</a></li> |
| <li><a class="main-nav-link" href="../../../api/scala/index.html">Scala</a></li> |
| <li><a class="main-nav-link" href="../../../api/r/index.html">R</a></li> |
| <li><a class="main-nav-link" href="../../../api/julia/index.html">Julia</a></li> |
| <li><a class="main-nav-link" href="../../../api/c++/index.html">C++</a></li> |
| <li><a class="main-nav-link" href="../../../api/perl/index.html">Perl</a></li> |
| </ul> |
| </span> |
| <span id="dropdown-menu-position-anchor-docs"> |
| <a aria-expanded="true" aria-haspopup="true" class="main-nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button">Docs <span class="caret"></span></a> |
| <ul class="dropdown-menu navbar-menu" id="package-dropdown-menu-docs"> |
| <li><a class="main-nav-link" href="../../../tutorials/index.html">Tutorials</a> |
| <li><a class="main-nav-link" href="../../../faq/index.html">FAQ</a></li> |
| <li><a class="main-nav-link" href="../../../architecture/index.html">Architecture</a></li> |
| <li><a class="main-nav-link" href="https://github.com/apache/incubator-mxnet/tree/master/example">Examples</a></li> |
| <li><a class="main-nav-link" href="../../../api/python/gluon/model_zoo.html">Gluon Model Zoo</a></li> |
| </li></ul> |
| </span> |
| <a class="main-nav-link" href="https://github.com/dmlc/mxnet">Github</a> |
| <span id="dropdown-menu-position-anchor-community"> |
| <a aria-expanded="true" aria-haspopup="true" class="main-nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button">Community <span class="caret"></span></a> |
| <ul class="dropdown-menu navbar-menu" id="package-dropdown-menu-community"> |
| <li><a class="main-nav-link" href="../../../community/index.html">Community</a></li> |
| <li><a class="main-nav-link" href="../../../community/contribute.html">Contribute</a></li> |
| <li><a class="main-nav-link" href="../../../community/powered_by.html">Powered By</a></li> |
| <li><a class="main-nav-link" href="http://discuss.mxnet.io">Discuss</a></li> |
| </ul> |
| </span> |
| <span id="dropdown-menu-position-anchor-version" style="position: relative"><a href="#" class="main-nav-link dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">Versions(master)<span class="caret"></span></a><ul id="package-dropdown-menu" class="dropdown-menu"><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/>1.1.0</a></li><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/versions/1.0.0/index.html>1.0.0</a></li><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/versions/0.12.1/index.html>0.12.1</a></li><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/versions/0.12.0/index.html>0.12.0</a></li><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/versions/0.11.0/index.html>0.11.0</a></li><li><a class="main-nav-link" href=https://mxnet.incubator.apache.org/versions/master/index.html>master</a></li></ul></span></nav> |
| <script> function getRootPath(){ return "../../../" } </script> |
| <div class="burgerIcon dropdown"> |
| <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button">☰</a> |
| <ul class="dropdown-menu" id="burgerMenu"> |
| <li><a href="../../../install/index.html">Install</a></li> |
| <li><a class="main-nav-link" href="../../../tutorials/index.html">Tutorials</a></li> |
| <li class="dropdown-submenu"> |
| <a href="#" tabindex="-1">Community</a> |
| <ul class="dropdown-menu"> |
| <li><a href="../../../community/index.html" tabindex="-1">Community</a></li> |
| <li><a href="../../../community/contribute.html" tabindex="-1">Contribute</a></li> |
| <li><a href="../../../community/powered_by.html" tabindex="-1">Powered By</a></li> |
| </ul> |
| </li> |
| <li class="dropdown-submenu"> |
| <a href="#" tabindex="-1">API</a> |
| <ul class="dropdown-menu"> |
| <li><a href="../../../api/python/index.html" tabindex="-1">Python</a> |
| </li> |
| <li><a href="../../../api/scala/index.html" tabindex="-1">Scala</a> |
| </li> |
| <li><a href="../../../api/r/index.html" tabindex="-1">R</a> |
| </li> |
| <li><a href="../../../api/julia/index.html" tabindex="-1">Julia</a> |
| </li> |
| <li><a href="../../../api/c++/index.html" tabindex="-1">C++</a> |
| </li> |
| <li><a href="../../../api/perl/index.html" tabindex="-1">Perl</a> |
| </li> |
| </ul> |
| </li> |
| <li class="dropdown-submenu"> |
| <a href="#" tabindex="-1">Docs</a> |
| <ul class="dropdown-menu"> |
| <li><a href="../../../tutorials/index.html" tabindex="-1">Tutorials</a></li> |
| <li><a href="../../../faq/index.html" tabindex="-1">FAQ</a></li> |
| <li><a href="../../../architecture/index.html" tabindex="-1">Architecture</a></li> |
| <li><a href="https://github.com/apache/incubator-mxnet/tree/master/example" tabindex="-1">Examples</a></li> |
| <li><a href="../../../api/python/gluon/model_zoo.html" tabindex="-1">Gluon Model Zoo</a></li> |
| </ul> |
| </li> |
| <li><a href="../../../architecture/index.html">Architecture</a></li> |
| <li><a class="main-nav-link" href="https://github.com/dmlc/mxnet">Github</a></li> |
| <li id="dropdown-menu-position-anchor-version-mobile" class="dropdown-submenu" style="position: relative"><a href="#" tabindex="-1">Versions(master)</a><ul class="dropdown-menu"><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/>1.1.0</a></li><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/versions/1.0.0/index.html>1.0.0</a></li><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/versions/0.12.1/index.html>0.12.1</a></li><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/versions/0.12.0/index.html>0.12.0</a></li><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/versions/0.11.0/index.html>0.11.0</a></li><li><a tabindex="-1" href=https://mxnet.incubator.apache.org/versions/master/index.html>master</a></li></ul></li></ul> |
| </div> |
| <div class="plusIcon dropdown"> |
| <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button"><span aria-hidden="true" class="glyphicon glyphicon-plus"></span></a> |
| <ul class="dropdown-menu dropdown-menu-right" id="plusMenu"></ul> |
| </div> |
| <div id="search-input-wrap"> |
| <form action="../../../search.html" autocomplete="off" class="" method="get" role="search"> |
| <div class="form-group inner-addon left-addon"> |
| <i class="glyphicon glyphicon-search"></i> |
| <input class="form-control" name="q" placeholder="Search" type="text"/> |
| </div> |
| <input name="check_keywords" type="hidden" value="yes"> |
| <input name="area" type="hidden" value="default"/> |
| </input></form> |
| <div id="search-preview"></div> |
| </div> |
| <div id="searchIcon"> |
| <span aria-hidden="true" class="glyphicon glyphicon-search"></span> |
| </div> |
| <!-- <div id="lang-select-wrap"> --> |
| <!-- <label id="lang-select-label"> --> |
| <!-- <\!-- <i class="fa fa-globe"></i> -\-> --> |
| <!-- <span></span> --> |
| <!-- </label> --> |
| <!-- <select id="lang-select"> --> |
| <!-- <option value="en">Eng</option> --> |
| <!-- <option value="zh">中文</option> --> |
| <!-- </select> --> |
| <!-- </div> --> |
| <!-- <a id="mobile-nav-toggle"> |
| <span class="mobile-nav-toggle-bar"></span> |
| <span class="mobile-nav-toggle-bar"></span> |
| <span class="mobile-nav-toggle-bar"></span> |
| </a> --> |
| </div> |
| </div> |
| </div> |
| <script type="text/javascript"> |
| $('body').css('background', 'white'); |
| </script> |
| <div class="container"> |
| <div class="row"> |
| <div aria-label="main navigation" class="sphinxsidebar leftsidebar" role="navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/python/index.html">Python Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/r/index.html">R Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/julia/index.html">Julia Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/c++/index.html">C++ Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/scala/index.html">Scala Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../api/perl/index.html">Perl Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../faq/index.html">HowTo Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../architecture/index.html">System Documents</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../tutorials/index.html">Tutorials</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../community/index.html">Community</a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="content"> |
| <div class="page-tracker"></div> |
| <h1>Source code for mxnet.gluon.block</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| |
| <span class="c1"># coding: utf-8</span> |
| <span class="c1"># pylint: disable= arguments-differ</span> |
| <span class="sd">"""Base container class for all neural network models."""</span> |
| <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'Block'</span><span class="p">,</span> <span class="s1">'HybridBlock'</span><span class="p">,</span> <span class="s1">'SymbolBlock'</span><span class="p">]</span> |
| |
| <span class="kn">import</span> <span class="nn">copy</span> |
| <span class="kn">import</span> <span class="nn">warnings</span> |
| <span class="kn">import</span> <span class="nn">re</span> |
| |
| <span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">symbol</span><span class="p">,</span> <span class="n">ndarray</span><span class="p">,</span> <span class="n">initializer</span> |
| <span class="kn">from</span> <span class="nn">..symbol</span> <span class="kn">import</span> <span class="n">Symbol</span> |
| <span class="kn">from</span> <span class="nn">..ndarray</span> <span class="kn">import</span> <span class="n">NDArray</span> |
| <span class="kn">from</span> <span class="nn">..</span> <span class="kn">import</span> <span class="n">name</span> <span class="k">as</span> <span class="n">_name</span> |
| <span class="kn">from</span> <span class="nn">.parameter</span> <span class="kn">import</span> <span class="n">Parameter</span><span class="p">,</span> <span class="n">ParameterDict</span><span class="p">,</span> <span class="n">DeferredInitializationError</span> |
| <span class="kn">from</span> <span class="nn">.utils</span> <span class="kn">import</span> <span class="n">_indent</span> |
| |
| |
| <span class="k">class</span> <span class="nc">_BlockScope</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""Scope for collecting child `Block` s."""</span> |
| <span class="n">_current</span> <span class="o">=</span> <span class="bp">None</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">block</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_block</span> <span class="o">=</span> <span class="n">block</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_counter</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_old_scope</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name_scope</span> <span class="o">=</span> <span class="bp">None</span> |
| |
| <span class="nd">@staticmethod</span> |
| <span class="k">def</span> <span class="nf">create</span><span class="p">(</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span><span class="p">,</span> <span class="n">hint</span><span class="p">):</span> |
| <span class="sd">"""Creates prefix and params for new `Block`."""</span> |
| <span class="n">current</span> <span class="o">=</span> <span class="n">_BlockScope</span><span class="o">.</span><span class="n">_current</span> |
| <span class="k">if</span> <span class="n">current</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">prefix</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="n">prefix</span> <span class="o">=</span> <span class="n">_name</span><span class="o">.</span><span class="n">NameManager</span><span class="o">.</span><span class="n">current</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="n">hint</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'_'</span> |
| <span class="k">if</span> <span class="n">params</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="n">params</span><span class="o">.</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">prefix</span><span class="p">,</span> <span class="n">params</span> |
| |
| <span class="k">if</span> <span class="n">prefix</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="n">count</span> <span class="o">=</span> <span class="n">current</span><span class="o">.</span><span class="n">_counter</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">hint</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> |
| <span class="n">prefix</span> <span class="o">=</span> <span class="s1">'</span><span class="si">%s%d</span><span class="s1">_'</span><span class="o">%</span><span class="p">(</span><span class="n">hint</span><span class="p">,</span> <span class="n">count</span><span class="p">)</span> |
| <span class="n">current</span><span class="o">.</span><span class="n">_counter</span><span class="p">[</span><span class="n">hint</span><span class="p">]</span> <span class="o">=</span> <span class="n">count</span> <span class="o">+</span> <span class="mi">1</span> |
| <span class="k">if</span> <span class="n">params</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="n">parent</span> <span class="o">=</span> <span class="n">current</span><span class="o">.</span><span class="n">_block</span><span class="o">.</span><span class="n">params</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="n">parent</span><span class="o">.</span><span class="n">prefix</span><span class="o">+</span><span class="n">prefix</span><span class="p">,</span> <span class="n">parent</span><span class="o">.</span><span class="n">_shared</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="n">params</span><span class="o">.</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">current</span><span class="o">.</span><span class="n">_block</span><span class="o">.</span><span class="n">prefix</span><span class="o">+</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span> |
| |
| <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_block</span><span class="o">.</span><span class="n">_empty_prefix</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_old_scope</span> <span class="o">=</span> <span class="n">_BlockScope</span><span class="o">.</span><span class="n">_current</span> |
| <span class="n">_BlockScope</span><span class="o">.</span><span class="n">_current</span> <span class="o">=</span> <span class="bp">self</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name_scope</span> <span class="o">=</span> <span class="n">_name</span><span class="o">.</span><span class="n">Prefix</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_block</span><span class="o">.</span><span class="n">prefix</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name_scope</span><span class="o">.</span><span class="fm">__enter__</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span> |
| |
| <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ptype</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">trace</span><span class="p">):</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_block</span><span class="o">.</span><span class="n">_empty_prefix</span><span class="p">:</span> |
| <span class="k">return</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name_scope</span><span class="o">.</span><span class="fm">__exit__</span><span class="p">(</span><span class="n">ptype</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">trace</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name_scope</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="n">_BlockScope</span><span class="o">.</span><span class="n">_current</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_old_scope</span> |
| |
| |
| <span class="k">def</span> <span class="nf">_flatten</span><span class="p">(</span><span class="n">args</span><span class="p">):</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">NDArray</span><span class="p">):</span> |
| <span class="k">return</span> <span class="p">[</span><span class="n">args</span><span class="p">],</span> <span class="nb">int</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">Symbol</span><span class="p">):</span> |
| <span class="n">length</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">list_outputs</span><span class="p">())</span> |
| <span class="n">length</span> <span class="o">=</span> <span class="n">length</span> <span class="k">if</span> <span class="n">length</span> <span class="o">></span> <span class="mi">1</span> <span class="k">else</span> <span class="mi">0</span> |
| <span class="k">return</span> <span class="p">[</span><span class="n">args</span><span class="p">],</span> <span class="nb">int</span><span class="p">(</span><span class="n">length</span><span class="p">)</span> |
| |
| <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)),</span> \ |
| <span class="s2">"HybridBlock input must be (nested) list of Symbol or NDArray, "</span> \ |
| <span class="s2">"but got </span><span class="si">%s</span><span class="s2"> of type </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">args</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">args</span><span class="p">)))</span> |
| <span class="n">flat</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="n">fmts</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">args</span><span class="p">:</span> |
| <span class="n">arg</span><span class="p">,</span> <span class="n">fmt</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> |
| <span class="n">flat</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> |
| <span class="n">fmts</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">fmt</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">flat</span><span class="p">,</span> <span class="n">fmts</span> |
| |
| |
| <span class="k">def</span> <span class="nf">_regroup</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">fmt</span><span class="p">):</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">fmt</span><span class="p">,</span> <span class="nb">int</span><span class="p">):</span> |
| <span class="k">if</span> <span class="n">fmt</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span> |
| <span class="k">return</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">args</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span> |
| <span class="k">return</span> <span class="n">args</span><span class="p">[:</span><span class="n">fmt</span><span class="p">],</span> <span class="n">args</span><span class="p">[</span><span class="n">fmt</span><span class="p">:]</span> |
| |
| <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)),</span> \ |
| <span class="s2">"HybridBlock output must be (nested) list of Symbol or NDArray, "</span> \ |
| <span class="s2">"but got </span><span class="si">%s</span><span class="s2"> of type </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">args</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">args</span><span class="p">)))</span> |
| <span class="n">ret</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">fmt</span><span class="p">:</span> |
| <span class="n">res</span><span class="p">,</span> <span class="n">args</span> <span class="o">=</span> <span class="n">_regroup</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">i</span><span class="p">)</span> |
| <span class="n">ret</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">ret</span><span class="p">,</span> <span class="n">args</span> |
| |
| |
| <div class="viewcode-block" id="Block"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block">[docs]</a><span class="k">class</span> <span class="nc">Block</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""Base class for all neural network layers and models. Your models should</span> |
| <span class="sd"> subclass this class.</span> |
| |
| <span class="sd"> :py:class:`Block` can be nested recursively in a tree structure. You can create and</span> |
| <span class="sd"> assign child :py:class:`Block` as regular attributes::</span> |
| |
| <span class="sd"> from mxnet.gluon import Block, nn</span> |
| <span class="sd"> from mxnet import ndarray as F</span> |
| |
| <span class="sd"> class Model(Block):</span> |
| <span class="sd"> def __init__(self, **kwargs):</span> |
| <span class="sd"> super(Model, self).__init__(**kwargs)</span> |
| <span class="sd"> # use name_scope to give child Blocks appropriate names.</span> |
| <span class="sd"> # It also allows sharing Parameters between Blocks recursively.</span> |
| <span class="sd"> with self.name_scope():</span> |
| <span class="sd"> self.dense0 = nn.Dense(20)</span> |
| <span class="sd"> self.dense1 = nn.Dense(20)</span> |
| |
| <span class="sd"> def forward(self, x):</span> |
| <span class="sd"> x = F.relu(self.dense0(x))</span> |
| <span class="sd"> return F.relu(self.dense1(x))</span> |
| |
| <span class="sd"> model = Model()</span> |
| <span class="sd"> model.initialize(ctx=mx.cpu(0))</span> |
| <span class="sd"> model(F.zeros((10, 10), ctx=mx.cpu(0)))</span> |
| |
| |
| <span class="sd"> Child :py:class:`Block` assigned this way will be registered and :py:meth:`collect_params`</span> |
| <span class="sd"> will collect their Parameters recursively.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> prefix : str</span> |
| <span class="sd"> Prefix acts like a name space. It will be prepended to the names of all</span> |
| <span class="sd"> Parameters and child :py:class:`Block` s in this :py:class:`Block` 's</span> |
| <span class="sd"> :py:meth:`name_scope` .</span> |
| <span class="sd"> Prefix should be unique within one model to prevent name collisions.</span> |
| <span class="sd"> params : ParameterDict or None</span> |
| <span class="sd"> :py:class:`ParameterDict` for sharing weights with the new :py:class:`Block`. For example,</span> |
| <span class="sd"> if you want ``dense1`` to share ``dense0``'s weights, you can do::</span> |
| |
| <span class="sd"> dense0 = nn.Dense(20)</span> |
| <span class="sd"> dense1 = nn.Dense(20, params=dense0.collect_params())</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_empty_prefix</span> <span class="o">=</span> <span class="n">prefix</span> <span class="o">==</span> <span class="s1">''</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_params</span> <span class="o">=</span> <span class="n">_BlockScope</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_alias</span><span class="p">())</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">'_'</span><span class="p">)</span> <span class="k">else</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_scope</span> <span class="o">=</span> <span class="n">_BlockScope</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_children</span> <span class="o">=</span> <span class="p">[]</span> |
| |
| <span class="k">def</span> <span class="fm">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="n">s</span> <span class="o">=</span> <span class="s1">'{name}(</span><span class="se">\n</span><span class="s1">{modstr}</span><span class="se">\n</span><span class="s1">)'</span> |
| <span class="n">modstr</span> <span class="o">=</span> <span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s1">' ({key}): {block}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">key</span><span class="o">=</span><span class="n">key</span><span class="p">,</span> |
| <span class="n">block</span><span class="o">=</span><span class="n">_indent</span><span class="p">(</span><span class="n">block</span><span class="o">.</span><span class="fm">__repr__</span><span class="p">(),</span> <span class="mi">2</span><span class="p">))</span> |
| <span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">block</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">block</span><span class="p">,</span> <span class="n">Block</span><span class="p">)])</span> |
| <span class="k">return</span> <span class="n">s</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> |
| <span class="n">modstr</span><span class="o">=</span><span class="n">modstr</span><span class="p">)</span> |
| |
| <div class="viewcode-block" id="Block.__setattr__"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.__setattr__">[docs]</a> <span class="k">def</span> <span class="fm">__setattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> |
| <span class="sd">"""Registers parameters."""</span> |
| |
| <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span> |
| <span class="n">existing</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">existing</span><span class="p">,</span> <span class="p">(</span><span class="n">Parameter</span><span class="p">,</span> <span class="n">Block</span><span class="p">))</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="nb">type</span><span class="p">(</span><span class="n">existing</span><span class="p">)):</span> |
| <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s1">'Changing attribute type for {name} from {type1} to {type2}'</span> \ |
| <span class="s1">'is not allowed.'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">,</span> |
| <span class="n">type1</span><span class="o">=</span><span class="nb">type</span><span class="p">(</span><span class="n">existing</span><span class="p">),</span> |
| <span class="n">type2</span><span class="o">=</span><span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)))</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">existing</span><span class="p">,</span> <span class="n">Block</span><span class="p">):</span> |
| <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">c</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="p">):</span> |
| <span class="k">if</span> <span class="n">c</span> <span class="ow">is</span> <span class="n">existing</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span> |
| <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">Block</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">register_child</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">Block</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">register_child</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> |
| |
| <span class="nb">super</span><span class="p">(</span><span class="n">Block</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__setattr__</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span></div> |
| |
| <span class="k">def</span> <span class="nf">_check_container_with_block</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">def</span> <span class="nf">_find_block_in_container</span><span class="p">(</span><span class="n">data</span><span class="p">):</span> |
| <span class="c1"># Find whether a nested container structure contains Blocks</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span> |
| <span class="k">for</span> <span class="n">ele</span> <span class="ow">in</span> <span class="n">data</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">_find_block_in_container</span><span class="p">(</span><span class="n">ele</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">True</span> |
| <span class="k">return</span> <span class="bp">False</span> |
| <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span> |
| <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">data</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">_find_block_in_container</span><span class="p">(</span><span class="n">v</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">True</span> |
| <span class="k">return</span> <span class="bp">False</span> |
| <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">Block</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">True</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">False</span> |
| <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">,</span> <span class="nb">dict</span><span class="p">))</span> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span><span class="n">k</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s1">'__'</span><span class="p">)</span> <span class="ow">or</span> <span class="n">k</span> <span class="o">==</span> <span class="s1">'_children'</span><span class="p">):</span> |
| <span class="k">if</span> <span class="n">_find_block_in_container</span><span class="p">(</span><span class="n">v</span><span class="p">):</span> |
| <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s1">'"{name}" is a container with Blocks. '</span> |
| <span class="s1">'Note that Blocks inside the list, tuple or dict will not be '</span> |
| <span class="s1">'registered automatically. Make sure to register them using '</span> |
| <span class="s1">'register_child() or switching to '</span> |
| <span class="s1">'nn.Sequential/nn.HybridSequential instead. '</span> |
| <span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">+</span> <span class="s2">"."</span> <span class="o">+</span> <span class="n">k</span><span class="p">))</span> |
| |
| <span class="k">def</span> <span class="nf">_alias</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">prefix</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Prefix of this :py:class:`Block`."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">name</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Name of this :py:class:`Block`, without '_' in the end."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_name</span> |
| |
| <div class="viewcode-block" id="Block.name_scope"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.name_scope">[docs]</a> <span class="k">def</span> <span class="nf">name_scope</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Returns a name space object managing a child :py:class:`Block` and parameter</span> |
| <span class="sd"> names. Should be used within a ``with`` statement::</span> |
| |
| <span class="sd"> with self.name_scope():</span> |
| <span class="sd"> self.dense = nn.Dense(20)</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_scope</span></div> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">params</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Returns this :py:class:`Block`'s parameter dictionary (does not include its</span> |
| <span class="sd"> children's parameters)."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_params</span> |
| |
| <div class="viewcode-block" id="Block.collect_params"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.collect_params">[docs]</a> <span class="k">def</span> <span class="nf">collect_params</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">select</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> |
| <span class="sd">"""Returns a :py:class:`ParameterDict` containing this :py:class:`Block` and all of its</span> |
| <span class="sd"> children's Parameters(default), also can returns the select :py:class:`ParameterDict`</span> |
| <span class="sd"> which match some given regular expressions.</span> |
| |
| <span class="sd"> For example, collect the specified parameter in ['conv1_weight', 'conv1_bias', 'fc_weight',</span> |
| <span class="sd"> 'fc_bias']::</span> |
| |
| <span class="sd"> model.collect_params('conv1_weight|conv1_bias|fc_weight|fc_bias')</span> |
| |
| <span class="sd"> or collect all paramters which their name ends with 'weight' or 'bias', this can be done</span> |
| <span class="sd"> using regular expressions::</span> |
| |
| <span class="sd"> model.collect_params('.*weight|.*bias')</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> select : str</span> |
| <span class="sd"> regular expressions</span> |
| |
| <span class="sd"> Returns</span> |
| <span class="sd"> -------</span> |
| <span class="sd"> The selected :py:class:`ParameterDict`</span> |
| <span class="sd"> """</span> |
| <span class="c1"># We need to check here because blocks inside containers are not supported.</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_check_container_with_block</span><span class="p">()</span> |
| <span class="n">ret</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_params</span><span class="o">.</span><span class="n">prefix</span><span class="p">)</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">select</span><span class="p">:</span> |
| <span class="n">ret</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">pattern</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">select</span><span class="p">)</span> |
| <span class="n">ret</span><span class="o">.</span><span class="n">update</span><span class="p">({</span><span class="n">name</span><span class="p">:</span><span class="n">value</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="n">pattern</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">name</span><span class="p">)})</span> |
| <span class="k">for</span> <span class="n">cld</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="p">:</span> |
| <span class="n">ret</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">cld</span><span class="o">.</span><span class="n">collect_params</span><span class="p">(</span><span class="n">select</span><span class="o">=</span><span class="n">select</span><span class="p">))</span> |
| <span class="k">return</span> <span class="n">ret</span></div> |
| |
| <div class="viewcode-block" id="Block.save_params"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.save_params">[docs]</a> <span class="k">def</span> <span class="nf">save_params</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span> |
| <span class="sd">"""Save parameters to file.</span> |
| |
| <span class="sd"> filename : str</span> |
| <span class="sd"> Path to file.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">strip_prefix</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">prefix</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.load_params"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.load_params">[docs]</a> <span class="k">def</span> <span class="nf">load_params</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">filename</span><span class="p">,</span> <span class="n">ctx</span><span class="p">,</span> <span class="n">allow_missing</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span> |
| <span class="n">ignore_extra</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span> |
| <span class="sd">"""Load parameters from file.</span> |
| |
| <span class="sd"> filename : str</span> |
| <span class="sd"> Path to parameter file.</span> |
| <span class="sd"> ctx : Context or list of Context</span> |
| <span class="sd"> Context(s) initialize loaded parameters on.</span> |
| <span class="sd"> allow_missing : bool, default False</span> |
| <span class="sd"> Whether to silently skip loading parameters not represents in the file.</span> |
| <span class="sd"> ignore_extra : bool, default False</span> |
| <span class="sd"> Whether to silently ignore parameters from the file that are not</span> |
| <span class="sd"> present in this Block.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">ctx</span><span class="p">,</span> <span class="n">allow_missing</span><span class="p">,</span> <span class="n">ignore_extra</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">prefix</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.register_child"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.register_child">[docs]</a> <span class="k">def</span> <span class="nf">register_child</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">block</span><span class="p">):</span> |
| <span class="sd">"""Registers block as a child of self. :py:class:`Block` s assigned to self as</span> |
| <span class="sd"> attributes will be registered automatically."""</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">block</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.initialize"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.initialize">[docs]</a> <span class="k">def</span> <span class="nf">initialize</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">init</span><span class="o">=</span><span class="n">initializer</span><span class="o">.</span><span class="n">Uniform</span><span class="p">(),</span> <span class="n">ctx</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">verbose</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span> |
| <span class="sd">"""Initializes :py:class:`Parameter` s of this :py:class:`Block` and its children.</span> |
| |
| <span class="sd"> Equivalent to ``block.collect_params().initialize(...)``</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">initialize</span><span class="p">(</span><span class="n">init</span><span class="p">,</span> <span class="n">ctx</span><span class="p">,</span> <span class="n">verbose</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.hybridize"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.hybridize">[docs]</a> <span class="k">def</span> <span class="nf">hybridize</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">active</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="sd">"""Activates or deactivates :py:class:`HybridBlock` s recursively. Has no effect on</span> |
| <span class="sd"> non-hybrid children.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> active : bool, default True</span> |
| <span class="sd"> Whether to turn hybrid on or off.</span> |
| <span class="sd"> **kwargs : string</span> |
| <span class="sd"> Additional flags for hybridized operator.</span> |
| <span class="sd"> """</span> |
| <span class="k">for</span> <span class="n">cld</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="p">:</span> |
| <span class="n">cld</span><span class="o">.</span><span class="n">hybridize</span><span class="p">(</span><span class="n">active</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.cast"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.cast">[docs]</a> <span class="k">def</span> <span class="nf">cast</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dtype</span><span class="p">):</span> |
| <span class="sd">"""Cast this Block to use another data type.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> dtype : str or numpy.dtype</span> |
| <span class="sd"> The new data type.</span> |
| <span class="sd"> """</span> |
| <span class="k">for</span> <span class="n">child</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_children</span><span class="p">:</span> |
| <span class="n">child</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">dtype</span><span class="p">)</span> |
| <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">param</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="n">param</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">dtype</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.__call__"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.__call__">[docs]</a> <span class="k">def</span> <span class="fm">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Calls forward. Only accepts positional arguments."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">forward</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="Block.forward"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.Block.forward">[docs]</a> <span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Overrides to implement forward computation using :py:class:`NDArray`. Only</span> |
| <span class="sd"> accepts positional arguments.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> *args : list of NDArray</span> |
| <span class="sd"> Input tensors.</span> |
| <span class="sd"> """</span> |
| <span class="c1"># pylint: disable= invalid-name</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span></div></div> |
| |
| |
| <div class="viewcode-block" id="HybridBlock"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock">[docs]</a><span class="k">class</span> <span class="nc">HybridBlock</span><span class="p">(</span><span class="n">Block</span><span class="p">):</span> |
| <span class="sd">"""`HybridBlock` supports forwarding with both Symbol and NDArray.</span> |
| |
| <span class="sd"> Forward computation in :py:class:`HybridBlock` must be static to work with :py:class:`Symbol` s,</span> |
| <span class="sd"> i.e. you cannot call :py:meth:`NDArray.asnumpy`, :py:attr:`NDArray.shape`,</span> |
| <span class="sd"> :py:attr:`NDArray.dtype`, etc on tensors.</span> |
| <span class="sd"> Also, you cannot use branching or loop logic that bases on non-constant</span> |
| <span class="sd"> expressions like random numbers or intermediate results, since they change</span> |
| <span class="sd"> the graph structure for each iteration.</span> |
| |
| <span class="sd"> Before activating with :py:meth:`hybridize()`, :py:class:`HybridBlock` works just like normal</span> |
| <span class="sd"> :py:class:`Block`. After activation, :py:class:`HybridBlock` will create a symbolic graph</span> |
| <span class="sd"> representing the forward computation and cache it. On subsequent forwards,</span> |
| <span class="sd"> the cached graph will be used instead of :py:meth:`hybrid_forward`.</span> |
| |
| <span class="sd"> Refer `Hybrid tutorial <https://mxnet.incubator.apache.org/versions/master/tutorials/gluon/hybrid.html>`_ to see</span> |
| <span class="sd"> the end-to-end usage.</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="n">prefix</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="n">params</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> <span class="o">=</span> <span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op_args</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_out_format</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="bp">False</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_flags</span> <span class="o">=</span> <span class="p">{}</span> |
| |
| <div class="viewcode-block" id="HybridBlock.__setattr__"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.__setattr__">[docs]</a> <span class="k">def</span> <span class="fm">__setattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> |
| <span class="sd">"""Registers parameters."""</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__setattr__</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">HybridBlock</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_clear_cached_op</span><span class="p">()</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">Parameter</span><span class="p">):</span> |
| <span class="k">assert</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span> <span class="ow">or</span> \ |
| <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="p">[</span><span class="n">name</span><span class="p">],</span> <span class="n">Parameter</span><span class="p">),</span> \ |
| <span class="s2">"Overriding Parameter attribute </span><span class="si">%s</span><span class="s2"> is not allowed. "</span> \ |
| <span class="s2">"Please pass in Parameters by specifying `params` at "</span> \ |
| <span class="s2">"Block construction instead."</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span></div> |
| |
| <span class="k">def</span> <span class="nf">_get_graph</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span><span class="p">:</span> |
| <span class="n">args</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span> |
| <span class="n">inputs</span> <span class="o">=</span> <span class="p">[</span><span class="n">symbol</span><span class="o">.</span><span class="n">var</span><span class="p">(</span><span class="s1">'data</span><span class="si">%d</span><span class="s1">'</span><span class="o">%</span><span class="n">i</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">))]</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">inputs</span> <span class="o">=</span> <span class="p">[</span><span class="n">symbol</span><span class="o">.</span><span class="n">var</span><span class="p">(</span><span class="s1">'data'</span><span class="p">)]</span> |
| <span class="n">grouped_inputs</span> <span class="o">=</span> <span class="n">_regroup</span><span class="p">(</span><span class="n">inputs</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span> |
| |
| <span class="n">params</span> <span class="o">=</span> <span class="p">{</span><span class="n">i</span><span class="p">:</span> <span class="n">j</span><span class="o">.</span><span class="n">var</span><span class="p">()</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> |
| <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">name_scope</span><span class="p">():</span> |
| <span class="n">out</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">hybrid_forward</span><span class="p">(</span><span class="n">symbol</span><span class="p">,</span> <span class="o">*</span><span class="n">grouped_inputs</span><span class="p">,</span> <span class="o">**</span><span class="n">params</span><span class="p">)</span> <span class="c1"># pylint: disable=no-value-for-parameter</span> |
| <span class="n">out</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_out_format</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">out</span><span class="p">)</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> <span class="o">=</span> <span class="n">inputs</span><span class="p">,</span> <span class="n">symbol</span><span class="o">.</span><span class="n">Group</span><span class="p">(</span><span class="n">out</span><span class="p">)</span> |
| |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> |
| |
| <span class="k">def</span> <span class="nf">_build_cache</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="n">inputs</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_graph</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">input_idx</span> <span class="o">=</span> <span class="p">{</span><span class="n">var</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">i</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">var</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">inputs</span><span class="p">)}</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op</span> <span class="o">=</span> <span class="n">ndarray</span><span class="o">.</span><span class="n">CachedOp</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_flags</span><span class="p">)</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">items</span><span class="p">())</span> |
| |
| <span class="c1"># verify graph inputs</span> |
| <span class="n">expected_inputs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">list_inputs</span><span class="p">())</span> |
| <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">expected_inputs</span><span class="p">:</span> |
| <span class="k">assert</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">params</span> <span class="ow">or</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">input_idx</span><span class="p">,</span> \ |
| <span class="s2">"Unknown input to HybridBlock: </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="n">name</span> |
| <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">input_idx</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expected_inputs</span><span class="p">:</span> |
| <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s2">"The </span><span class="si">%d</span><span class="s2">-th input to HybridBlock is not used by any "</span> |
| <span class="s2">"computation. Is this intended?"</span><span class="o">%</span><span class="n">i</span><span class="p">)</span> |
| <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">params</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expected_inputs</span><span class="p">:</span> |
| <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s2">"Parameter </span><span class="si">%s</span><span class="s2"> is not used by any computation. "</span> |
| <span class="s2">"Is this intended?"</span><span class="o">%</span><span class="n">name</span><span class="p">)</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op_args</span> <span class="o">=</span> <span class="p">[(</span><span class="bp">False</span><span class="p">,</span> <span class="n">params</span><span class="p">[</span><span class="n">name</span><span class="p">])</span> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">params</span> |
| <span class="k">else</span> <span class="p">(</span><span class="bp">True</span><span class="p">,</span> <span class="n">input_idx</span><span class="p">[</span><span class="n">name</span><span class="p">])</span> |
| <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">out</span><span class="o">.</span><span class="n">list_inputs</span><span class="p">()]</span> |
| |
| <span class="k">def</span> <span class="nf">_finish_deferred_init</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">hybrid</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">infer_shape</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">hybrid</span><span class="p">:</span> |
| <span class="k">for</span> <span class="n">is_arg</span><span class="p">,</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op_args</span><span class="p">:</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">is_arg</span><span class="p">:</span> |
| <span class="n">i</span><span class="o">.</span><span class="n">_finish_deferred_init</span><span class="p">()</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="n">i</span><span class="o">.</span><span class="n">_finish_deferred_init</span><span class="p">()</span> |
| |
| <span class="k">def</span> <span class="nf">_call_cached_op</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_build_cache</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| |
| <span class="n">args</span><span class="p">,</span> <span class="n">fmt</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> |
| <span class="k">assert</span> <span class="n">fmt</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span><span class="p">,</span> <span class="s2">"Invalid input format"</span> |
| <span class="n">cargs</span> <span class="o">=</span> <span class="p">[</span><span class="n">args</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="k">if</span> <span class="n">is_arg</span> <span class="k">else</span> <span class="n">i</span><span class="o">.</span><span class="n">data</span><span class="p">()</span> |
| <span class="k">for</span> <span class="n">is_arg</span><span class="p">,</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op_args</span><span class="p">]</span> |
| <span class="n">out</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op</span><span class="p">(</span><span class="o">*</span><span class="n">cargs</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">NDArray</span><span class="p">):</span> |
| <span class="n">out</span> <span class="o">=</span> <span class="p">[</span><span class="n">out</span><span class="p">]</span> |
| <span class="k">return</span> <span class="n">_regroup</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_out_format</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span> |
| |
| <span class="k">def</span> <span class="nf">_clear_cached_op</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> <span class="o">=</span> <span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op</span> <span class="o">=</span> <span class="bp">None</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_op_args</span> <span class="o">=</span> <span class="bp">None</span> |
| |
| <span class="k">def</span> <span class="nf">register_child</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">block</span><span class="p">):</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">block</span><span class="p">,</span> <span class="n">HybridBlock</span><span class="p">):</span> |
| <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> |
| <span class="s2">"Children of HybridBlock must also be HybridBlock, "</span> \ |
| <span class="s2">"but </span><span class="si">%s</span><span class="s2"> has type </span><span class="si">%s</span><span class="s2">. If you are using Sequential, "</span> \ |
| <span class="s2">"please try HybridSequential instead"</span><span class="o">%</span><span class="p">(</span> |
| <span class="nb">str</span><span class="p">(</span><span class="n">block</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">block</span><span class="p">))))</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">register_child</span><span class="p">(</span><span class="n">block</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_clear_cached_op</span><span class="p">()</span> |
| |
| <span class="k">def</span> <span class="nf">hybridize</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">active</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="n">active</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_flags</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_clear_cached_op</span><span class="p">()</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">hybridize</span><span class="p">(</span><span class="n">active</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">cast</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dtype</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_clear_cached_op</span><span class="p">()</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">dtype</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">_infer_attrs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">infer_fn</span><span class="p">,</span> <span class="n">attr</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Generic infer attributes."""</span> |
| <span class="n">inputs</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_graph</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">args</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">arg_attrs</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">aux_attrs</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">infer_fn</span><span class="p">)(</span> |
| <span class="o">**</span><span class="p">{</span><span class="n">i</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">j</span><span class="p">,</span> <span class="n">attr</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">inputs</span><span class="p">,</span> <span class="n">args</span><span class="p">)})</span> |
| <span class="n">sdict</span> <span class="o">=</span> <span class="p">{</span><span class="n">i</span><span class="p">:</span> <span class="n">j</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">list_arguments</span><span class="p">(),</span> <span class="n">arg_attrs</span><span class="p">)}</span> |
| <span class="n">sdict</span><span class="o">.</span><span class="n">update</span><span class="p">({</span><span class="n">name</span> <span class="p">:</span> <span class="n">attr</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">attr</span> <span class="ow">in</span> \ |
| <span class="nb">zip</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">list_auxiliary_states</span><span class="p">(),</span> <span class="n">aux_attrs</span><span class="p">)})</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">values</span><span class="p">():</span> |
| <span class="nb">setattr</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">attr</span><span class="p">,</span> <span class="n">sdict</span><span class="p">[</span><span class="n">i</span><span class="o">.</span><span class="n">name</span><span class="p">])</span> |
| |
| <div class="viewcode-block" id="HybridBlock.infer_shape"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.infer_shape">[docs]</a> <span class="k">def</span> <span class="nf">infer_shape</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Infers shape of Parameters from inputs."""</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_infer_attrs</span><span class="p">(</span><span class="s1">'infer_shape'</span><span class="p">,</span> <span class="s1">'shape'</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="HybridBlock.infer_type"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.infer_type">[docs]</a> <span class="k">def</span> <span class="nf">infer_type</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Infers data type of Parameters from inputs."""</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_infer_attrs</span><span class="p">(</span><span class="s1">'infer_type'</span><span class="p">,</span> <span class="s1">'dtype'</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="HybridBlock.export"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.export">[docs]</a> <span class="k">def</span> <span class="nf">export</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="n">epoch</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span> |
| <span class="sd">"""Export HybridBlock to json format that can be loaded by `mxnet.mod.Module`</span> |
| <span class="sd"> or the C++ interface.</span> |
| |
| <span class="sd"> .. note:: When there are only one input, it will have name `data`. When there</span> |
| <span class="sd"> Are more than one inputs, they will be named as `data0`, `data1`, etc.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> path : str</span> |
| <span class="sd"> Path to save model. Two files `path-symbol.json` and `path-xxxx.params`</span> |
| <span class="sd"> will be created, where xxxx is the 4 digits epoch number.</span> |
| <span class="sd"> epoch : int</span> |
| <span class="sd"> Epoch number of saved model.</span> |
| <span class="sd"> """</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span> |
| <span class="s2">"Please first call block.hybridize() and then run forward with "</span> |
| <span class="s2">"this block at least once before calling export."</span><span class="p">)</span> |
| <span class="n">sym</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> |
| <span class="n">sym</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s1">'</span><span class="si">%s</span><span class="s1">-symbol.json'</span><span class="o">%</span><span class="n">path</span><span class="p">)</span> |
| |
| <span class="n">arg_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">sym</span><span class="o">.</span><span class="n">list_arguments</span><span class="p">())</span> |
| <span class="n">aux_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">sym</span><span class="o">.</span><span class="n">list_auxiliary_states</span><span class="p">())</span> |
| <span class="n">arg_dict</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">param</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">collect_params</span><span class="p">()</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">arg_names</span><span class="p">:</span> |
| <span class="n">arg_dict</span><span class="p">[</span><span class="s1">'arg:</span><span class="si">%s</span><span class="s1">'</span><span class="o">%</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">param</span><span class="o">.</span><span class="n">_reduce</span><span class="p">()</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">assert</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">aux_names</span> |
| <span class="n">arg_dict</span><span class="p">[</span><span class="s1">'aux:</span><span class="si">%s</span><span class="s1">'</span><span class="o">%</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">param</span><span class="o">.</span><span class="n">_reduce</span><span class="p">()</span> |
| <span class="n">ndarray</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s1">'</span><span class="si">%s</span><span class="s1">-</span><span class="si">%04d</span><span class="s1">.params'</span><span class="o">%</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">epoch</span><span class="p">),</span> <span class="n">arg_dict</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="HybridBlock.forward"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.forward">[docs]</a> <span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="sd">"""Defines the forward computation. Arguments can be either</span> |
| <span class="sd"> :py:class:`NDArray` or :py:class:`Symbol`."""</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">NDArray</span><span class="p">):</span> |
| <span class="k">with</span> <span class="n">x</span><span class="o">.</span><span class="n">context</span> <span class="k">as</span> <span class="n">ctx</span><span class="p">:</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_call_cached_op</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="p">{</span><span class="n">i</span><span class="p">:</span> <span class="n">j</span><span class="o">.</span><span class="n">data</span><span class="p">(</span><span class="n">ctx</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> |
| <span class="k">except</span> <span class="n">DeferredInitializationError</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_finish_deferred_init</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_call_cached_op</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="p">{</span><span class="n">i</span><span class="p">:</span> <span class="n">j</span><span class="o">.</span><span class="n">data</span><span class="p">(</span><span class="n">ctx</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">hybrid_forward</span><span class="p">(</span><span class="n">ndarray</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">params</span><span class="p">)</span> |
| |
| <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">Symbol</span><span class="p">),</span> \ |
| <span class="s2">"HybridBlock requires the first argument to forward be either "</span> \ |
| <span class="s2">"Symbol or NDArray, but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="nb">type</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> |
| <span class="n">params</span> <span class="o">=</span> <span class="p">{</span><span class="n">i</span><span class="p">:</span> <span class="n">j</span><span class="o">.</span><span class="n">var</span><span class="p">()</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_reg_params</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> |
| <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">name_scope</span><span class="p">():</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">hybrid_forward</span><span class="p">(</span><span class="n">symbol</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">params</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="HybridBlock.hybrid_forward"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.HybridBlock.hybrid_forward">[docs]</a> <span class="k">def</span> <span class="nf">hybrid_forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">F</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="sd">"""Overrides to construct symbolic graph for this `Block`.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> x : Symbol or NDArray</span> |
| <span class="sd"> The first input tensor.</span> |
| <span class="sd"> *args : list of Symbol or list of NDArray</span> |
| <span class="sd"> Additional input tensors.</span> |
| <span class="sd"> """</span> |
| <span class="c1"># pylint: disable= invalid-name</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span></div></div> |
| |
| |
| <div class="viewcode-block" id="SymbolBlock"><a class="viewcode-back" href="../../../api/python/gluon/gluon.html#mxnet.gluon.SymbolBlock">[docs]</a><span class="k">class</span> <span class="nc">SymbolBlock</span><span class="p">(</span><span class="n">HybridBlock</span><span class="p">):</span> |
| <span class="sd">"""Construct block from symbol. This is useful for using pre-trained models</span> |
| <span class="sd"> as feature extractors. For example, you may want to extract the output</span> |
| <span class="sd"> from fc2 layer in AlexNet.</span> |
| |
| <span class="sd"> Parameters</span> |
| <span class="sd"> ----------</span> |
| <span class="sd"> outputs : Symbol or list of Symbol</span> |
| <span class="sd"> The desired output for SymbolBlock.</span> |
| <span class="sd"> inputs : Symbol or list of Symbol</span> |
| <span class="sd"> The Variables in output's argument that should be used as inputs.</span> |
| <span class="sd"> params : ParameterDict</span> |
| <span class="sd"> Parameter dictionary for arguments and auxililary states of outputs</span> |
| <span class="sd"> that are not inputs.</span> |
| |
| <span class="sd"> Examples</span> |
| <span class="sd"> --------</span> |
| <span class="sd"> >>> # To extract the feature from fc1 and fc2 layers of AlexNet:</span> |
| <span class="sd"> >>> alexnet = gluon.model_zoo.vision.alexnet(pretrained=True, ctx=mx.cpu(),</span> |
| <span class="sd"> prefix='model_')</span> |
| <span class="sd"> >>> inputs = mx.sym.var('data')</span> |
| <span class="sd"> >>> out = alexnet(inputs)</span> |
| <span class="sd"> >>> internals = out.get_internals()</span> |
| <span class="sd"> >>> print(internals.list_outputs())</span> |
| <span class="sd"> ['data', ..., 'model_dense0_relu_fwd_output', ..., 'model_dense1_relu_fwd_output', ...]</span> |
| <span class="sd"> >>> outputs = [internals['model_dense0_relu_fwd_output'],</span> |
| <span class="sd"> internals['model_dense1_relu_fwd_output']]</span> |
| <span class="sd"> >>> # Create SymbolBlock that shares parameters with alexnet</span> |
| <span class="sd"> >>> feat_model = gluon.SymbolBlock(outputs, inputs, params=alexnet.collect_params())</span> |
| <span class="sd"> >>> x = mx.nd.random.normal(shape=(16, 3, 224, 224))</span> |
| <span class="sd"> >>> print(feat_model(x))</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">outputs</span><span class="p">,</span> <span class="n">inputs</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">SymbolBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">params</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_prefix</span> <span class="o">=</span> <span class="s1">''</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_params</span> <span class="o">=</span> <span class="n">ParameterDict</span><span class="p">(</span><span class="s1">''</span><span class="p">,</span> <span class="n">params</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inputs</span><span class="p">,</span> <span class="n">symbol</span><span class="o">.</span><span class="n">Symbol</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">inputs</span><span class="o">.</span><span class="n">list_outputs</span><span class="p">())</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span> |
| <span class="n">inputs</span> <span class="o">=</span> <span class="p">[</span><span class="n">inputs</span><span class="p">]</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">outputs</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">))</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">outputs</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span> |
| <span class="n">outputs</span> <span class="o">=</span> <span class="n">outputs</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> |
| |
| <span class="n">syms</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">inputs</span><span class="p">)</span> |
| <span class="n">out</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_out_format</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">(</span><span class="n">outputs</span><span class="p">)</span> |
| <span class="n">out</span> <span class="o">=</span> <span class="n">symbol</span><span class="o">.</span><span class="n">Group</span><span class="p">(</span><span class="n">out</span><span class="p">)</span> |
| |
| <span class="n">input_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span> |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">syms</span><span class="p">:</span> |
| <span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">i</span><span class="o">.</span><span class="n">get_internals</span><span class="p">()</span><span class="o">.</span><span class="n">list_outputs</span><span class="p">())</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> \ |
| <span class="s2">"Input symbols must be variable, but </span><span class="si">%s</span><span class="s2"> is an output of operators"</span><span class="o">%</span><span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> |
| <span class="n">input_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">i</span><span class="o">.</span><span class="n">name</span><span class="p">)</span> |
| |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">out</span><span class="o">.</span><span class="n">list_arguments</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">i</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">input_names</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">allow_deferred_init</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> |
| |
| <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">out</span><span class="o">.</span><span class="n">list_auxiliary_states</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">i</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">input_names</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">grad_req</span><span class="o">=</span><span class="s1">'null'</span><span class="p">,</span> <span class="n">allow_deferred_init</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> <span class="o">=</span> <span class="n">syms</span><span class="p">,</span> <span class="n">out</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_build_cache</span><span class="p">()</span> |
| |
| <span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">NDArray</span><span class="p">):</span> |
| <span class="k">with</span> <span class="n">x</span><span class="o">.</span><span class="n">context</span><span class="p">:</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_call_cached_op</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| <span class="k">except</span> <span class="n">DeferredInitializationError</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_finish_deferred_init</span><span class="p">(</span><span class="bp">True</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_call_cached_op</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span> |
| |
| <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">Symbol</span><span class="p">),</span> \ |
| <span class="s2">"HybridBlock requires the first argument to forward be either "</span> \ |
| <span class="s2">"Symbol or NDArray, but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="nb">type</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> |
| <span class="n">args</span><span class="p">,</span> <span class="n">in_fmt</span> <span class="o">=</span> <span class="n">_flatten</span><span class="p">([</span><span class="n">x</span><span class="p">]</span> <span class="o">+</span> <span class="nb">list</span><span class="p">(</span><span class="n">args</span><span class="p">))</span> |
| <span class="k">assert</span> <span class="n">in_fmt</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_in_format</span><span class="p">,</span> <span class="s2">"Invalid input format"</span> |
| <span class="n">ret</span> <span class="o">=</span> <span class="n">copy</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span> |
| <span class="n">ret</span><span class="o">.</span><span class="n">_compose</span><span class="p">(</span><span class="o">**</span><span class="p">{</span><span class="n">k</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">v</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">args</span><span class="p">)})</span> |
| <span class="k">return</span> <span class="n">_regroup</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">ret</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_out_format</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span> |
| |
| <span class="k">def</span> <span class="nf">_clear_cached_op</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="n">tmp</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">SymbolBlock</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">_clear_cached_op</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_cached_graph</span> <span class="o">=</span> <span class="n">tmp</span> |
| |
| <span class="k">def</span> <span class="nf">hybrid_forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">F</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span></div> |
| </pre></div> |
| </div> |
| </div> |
| <div aria-label="main navigation" class="sphinxsidebar rightsidebar" role="navigation"> |
| <div class="sphinxsidebarwrapper"> |
| </div> |
| </div> |
| </div><div class="footer"> |
| <div class="section-disclaimer"> |
| <div class="container"> |
| <div> |
| <img height="60" src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/apache_incubator_logo.png"/> |
| <p> |
| Apache MXNet is an effort undergoing incubation at The Apache Software Foundation (ASF), <strong>sponsored by the <i>Apache Incubator</i></strong>. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF. |
| </p> |
| <p> |
| "Copyright © 2017-2018, The Apache Software Foundation |
| Apache MXNet, MXNet, Apache, the Apache feather, and the Apache MXNet project logo are either registered trademarks or trademarks of the Apache Software Foundation." |
| </p> |
| </div> |
| </div> |
| </div> |
| </div> <!-- pagename != index --> |
| </div> |
| <script crossorigin="anonymous" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> |
| <script src="../../../_static/js/sidebar.js" type="text/javascript"></script> |
| <script src="../../../_static/js/search.js" type="text/javascript"></script> |
| <script src="../../../_static/js/navbar.js" type="text/javascript"></script> |
| <script src="../../../_static/js/clipboard.min.js" type="text/javascript"></script> |
| <script src="../../../_static/js/copycode.js" type="text/javascript"></script> |
| <script src="../../../_static/js/page.js" type="text/javascript"></script> |
| <script type="text/javascript"> |
| $('body').ready(function () { |
| $('body').css('visibility', 'visible'); |
| }); |
| </script> |
| </body> |
| </html> |
