blob: 198daa49ed79255e12178db8ff4766e63bcaa8ed [file]
<!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"/>
<meta content="mxnet.gluon.data.sampler" property="og:title">
<meta content="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/og-logo.png" property="og:image">
<meta content="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/og-logo.png" property="og:image:secure_url">
<meta content="mxnet.gluon.data.sampler" property="og:description"/>
<title>mxnet.gluon.data.sampler — 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: '.txt'
};
</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("/versions/1.5.0/searchindex.js"); Search.init();}); </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://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> -->
<!-- -->
<link href="../../../../genindex.html" rel="index" title="Index">
<link href="../../../../search.html" rel="search" title="Search"/>
<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></meta></meta></meta></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="/versions/1.5.0/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="/versions/1.5.0/tutorials/gluon/gluon.html">About</a></li>
<li><a class="main-nav-link" href="https://www.d2l.ai/">Dive into Deep Learning</a></li>
<li><a class="main-nav-link" href="https://gluon-cv.mxnet.io">GluonCV Toolkit</a></li>
<li><a class="main-nav-link" href="https://gluon-nlp.mxnet.io/">GluonNLP Toolkit</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="/versions/1.5.0/api/python/index.html">Python</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/c++/index.html">C++</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/clojure/index.html">Clojure</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/java/index.html">Java</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/julia/index.html">Julia</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/perl/index.html">Perl</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/r/index.html">R</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/scala/index.html">Scala</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="/versions/1.5.0/faq/index.html">FAQ</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/tutorials/index.html">Tutorials</a>
<li><a class="main-nav-link" href="https://github.com/apache/incubator-mxnet/tree/1.5.0/example">Examples</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/architecture/index.html">Architecture</a></li>
<li><a class="main-nav-link" href="https://cwiki.apache.org/confluence/display/MXNET/Apache+MXNet+Home">Developer Wiki</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/model_zoo/index.html">Model Zoo</a></li>
<li><a class="main-nav-link" href="https://github.com/onnx/onnx-mxnet">ONNX</a></li>
</li></ul>
</span>
<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="http://discuss.mxnet.io">Forum</a></li>
<li><a class="main-nav-link" href="https://github.com/apache/incubator-mxnet/tree/1.5.0">Github</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/community/contribute.html">Contribute</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/community/ecosystem.html">Ecosystem</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/community/powered_by.html">Powered By</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">1.5.0<span class="caret"></span></a><ul id="package-dropdown-menu" class="dropdown-menu"><li><a href="/">master</a></li><li><a href="/versions/1.7.0/">1.7.0</a></li><li><a href=/versions/1.6.0/>1.6.0</a></li><li><a href=/versions/1.5.0/>1.5.0</a></li><li><a href=/versions/1.4.1/>1.4.1</a></li><li><a href=/versions/1.3.1/>1.3.1</a></li><li><a href=/versions/1.2.1/>1.2.1</a></li><li><a href=/versions/1.1.0/>1.1.0</a></li><li><a href=/versions/1.0.0/>1.0.0</a></li><li><a href=/versions/0.12.1/>0.12.1</a></li><li><a href=/versions/0.11.0/>0.11.0</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="/versions/1.5.0/install/index.html">Install</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/tutorials/index.html">Tutorials</a></li>
<li class="dropdown-submenu dropdown">
<a aria-expanded="true" aria-haspopup="true" class="dropdown-toggle burger-link" data-toggle="dropdown" href="#" tabindex="-1">Gluon</a>
<ul class="dropdown-menu navbar-menu" id="package-dropdown-menu">
<li><a class="main-nav-link" href="/versions/1.5.0/tutorials/gluon/gluon.html">About</a></li>
<li><a class="main-nav-link" href="http://gluon.mxnet.io">The Straight Dope (Tutorials)</a></li>
<li><a class="main-nav-link" href="https://gluon-cv.mxnet.io">GluonCV Toolkit</a></li>
<li><a class="main-nav-link" href="https://gluon-nlp.mxnet.io/">GluonNLP Toolkit</a></li>
</ul>
</li>
<li class="dropdown-submenu">
<a aria-expanded="true" aria-haspopup="true" class="dropdown-toggle burger-link" data-toggle="dropdown" href="#" tabindex="-1">API</a>
<ul class="dropdown-menu">
<li><a class="main-nav-link" href="/versions/1.5.0/api/python/index.html">Python</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/c++/index.html">C++</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/clojure/index.html">Clojure</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/java/index.html">Java</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/julia/index.html">Julia</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/perl/index.html">Perl</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/r/index.html">R</a></li>
<li><a class="main-nav-link" href="/versions/1.5.0/api/scala/index.html">Scala</a></li>
</ul>
</li>
<li class="dropdown-submenu">
<a aria-expanded="true" aria-haspopup="true" class="dropdown-toggle burger-link" data-toggle="dropdown" href="#" tabindex="-1">Docs</a>
<ul class="dropdown-menu">
<li><a href="/versions/1.5.0/faq/index.html" tabindex="-1">FAQ</a></li>
<li><a href="/versions/1.5.0/tutorials/index.html" tabindex="-1">Tutorials</a></li>
<li><a href="https://github.com/apache/incubator-mxnet/tree/1.5.0/example" tabindex="-1">Examples</a></li>
<li><a href="/versions/1.5.0/architecture/index.html" tabindex="-1">Architecture</a></li>
<li><a href="https://cwiki.apache.org/confluence/display/MXNET/Apache+MXNet+Home" tabindex="-1">Developer Wiki</a></li>
<li><a href="/versions/1.5.0/model_zoo/index.html" tabindex="-1">Gluon Model Zoo</a></li>
<li><a href="https://github.com/onnx/onnx-mxnet" tabindex="-1">ONNX</a></li>
</ul>
</li>
<li class="dropdown-submenu dropdown">
<a aria-haspopup="true" class="dropdown-toggle burger-link" data-toggle="dropdown" href="#" role="button" tabindex="-1">Community</a>
<ul class="dropdown-menu">
<li><a href="http://discuss.mxnet.io" tabindex="-1">Forum</a></li>
<li><a href="https://github.com/apache/incubator-mxnet/tree/1.5.0" tabindex="-1">Github</a></li>
<li><a href="/versions/1.5.0/community/contribute.html" tabindex="-1">Contribute</a></li>
<li><a href="/versions/1.5.0/community/ecosystem.html" tabindex="-1">Ecosystem</a></li>
<li><a href="/versions/1.5.0/community/powered_by.html" tabindex="-1">Powered By</a></li>
</ul>
</li>
<li id="dropdown-menu-position-anchor-version-mobile" class="dropdown-submenu" style="position: relative"><a href="#" tabindex="-1">1.5.0</a><ul class="dropdown-menu"><li><a tabindex="-1" href=/>master</a></li><li><a tabindex="-1" href=/versions/1.6.0/>1.6.0</a></li><li><a tabindex="-1" href=/versions/1.5.0/>1.5.0</a></li><li><a tabindex="-1" href=/versions/1.4.1/>1.4.1</a></li><li><a tabindex="-1" href=/versions/1.3.1/>1.3.1</a></li><li><a tabindex="-1" href=/versions/1.2.1/>1.2.1</a></li><li><a tabindex="-1" href=/versions/1.1.0/>1.1.0</a></li><li><a tabindex="-1" href=/versions/1.0.0/>1.0.0</a></li><li><a tabindex="-1" href=/versions/0.12.1/>0.12.1</a></li><li><a tabindex="-1" href=/versions/0.11.0/>0.11.0</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/index.html">MXNet APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../architecture/index.html">MXNet Architecture</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../community/index.html">MXNet Community</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../faq/index.html">MXNet FAQ</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../gluon/index.html">About Gluon</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../install/index.html">Installing MXNet</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../install/index.html#nvidia-jetson-tx-family">Nvidia Jetson TX family</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../install/index.html#source-download">Source Download</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../model_zoo/index.html">MXNet Model Zoo</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../tutorials/index.html">Tutorials</a></li>
</ul>
</div>
</div>
<div class="content">
<div class="page-tracker"></div>
<h1>Source code for mxnet.gluon.data.sampler</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=</span>
<span class="sd">"""Dataset sampler."""</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'Sampler'</span><span class="p">,</span> <span class="s1">'SequentialSampler'</span><span class="p">,</span> <span class="s1">'RandomSampler'</span><span class="p">,</span> <span class="s1">'BatchSampler'</span><span class="p">]</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<div class="viewcode-block" id="Sampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.Sampler">[docs]</a><span class="k">class</span> <span class="nc">Sampler</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Base class for samplers.</span>
<span class="sd"> All samplers should subclass `Sampler` and define `__iter__` and `__len__`</span>
<span class="sd"> methods.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span>
<span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span></div>
<div class="viewcode-block" id="SequentialSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.SequentialSampler">[docs]</a><span class="k">class</span> <span class="nc">SequentialSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span>
<span class="sd">"""Samples elements from [0, length) sequentially.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> length : int</span>
<span class="sd"> Length of the sequence.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_length</span> <span class="o">=</span> <span class="n">length</span>
<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">iter</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_length</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">__len__</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="n">_length</span></div>
<div class="viewcode-block" id="RandomSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.RandomSampler">[docs]</a><span class="k">class</span> <span class="nc">RandomSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span>
<span class="sd">"""Samples elements from [0, length) randomly without replacement.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> length : int</span>
<span class="sd"> Length of the sequence.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_length</span> <span class="o">=</span> <span class="n">length</span>
<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">indices</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_length</span><span class="p">)</span>
<span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">shuffle</span><span class="p">(</span><span class="n">indices</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">iter</span><span class="p">(</span><span class="n">indices</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__len__</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="n">_length</span></div>
<div class="viewcode-block" id="BatchSampler"><a class="viewcode-back" href="../../../../api/python/gluon/data.html#mxnet.gluon.data.BatchSampler">[docs]</a><span class="k">class</span> <span class="nc">BatchSampler</span><span class="p">(</span><span class="n">Sampler</span><span class="p">):</span>
<span class="sd">"""Wraps over another `Sampler` and return mini-batches of samples.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> sampler : Sampler</span>
<span class="sd"> The source Sampler.</span>
<span class="sd"> batch_size : int</span>
<span class="sd"> Size of mini-batch.</span>
<span class="sd"> last_batch : {'keep', 'discard', 'rollover'}</span>
<span class="sd"> Specifies how the last batch is handled if batch_size does not evenly</span>
<span class="sd"> divide sequence length.</span>
<span class="sd"> If 'keep', the last batch will be returned directly, but will contain</span>
<span class="sd"> less element than `batch_size` requires.</span>
<span class="sd"> If 'discard', the last batch will be discarded.</span>
<span class="sd"> If 'rollover', the remaining elements will be rolled over to the next</span>
<span class="sd"> iteration.</span>
<span class="sd"> Examples</span>
<span class="sd"> --------</span>
<span class="sd"> >>> sampler = gluon.data.SequentialSampler(10)</span>
<span class="sd"> >>> batch_sampler = gluon.data.BatchSampler(sampler, 3, 'keep')</span>
<span class="sd"> >>> list(batch_sampler)</span>
<span class="sd"> [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sampler</span><span class="p">,</span> <span class="n">batch_size</span><span class="p">,</span> <span class="n">last_batch</span><span class="o">=</span><span class="s1">'keep'</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span> <span class="o">=</span> <span class="n">sampler</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> <span class="o">=</span> <span class="n">batch_size</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">=</span> <span class="n">last_batch</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">batch</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prev</span><span class="p">,</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">_sampler</span><span class="p">:</span>
<span class="n">batch</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">i</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">batch</span><span class="p">)</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">batch</span>
<span class="n">batch</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="n">batch</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'keep'</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">batch</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'discard'</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'rollover'</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_prev</span> <span class="o">=</span> <span class="n">batch</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s2">"last_batch must be one of 'keep', 'discard', or 'rollover', "</span> \
<span class="s2">"but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__len__</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">_last_batch</span> <span class="o">==</span> <span class="s1">'keep'</span><span class="p">:</span>
<span class="k">return</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'discard'</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">)</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span> <span class="o">==</span> <span class="s1">'rollover'</span><span class="p">:</span>
<span class="k">return</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_prev</span><span class="p">)</span> <span class="o">+</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sampler</span><span class="p">))</span> <span class="o">//</span> <span class="bp">self</span><span class="o">.</span><span class="n">_batch_size</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s2">"last_batch must be one of 'keep', 'discard', or 'rollover', "</span> \
<span class="s2">"but got </span><span class="si">%s</span><span class="s2">"</span><span class="o">%</span><span class="bp">self</span><span class="o">.</span><span class="n">_last_batch</span><span class="p">)</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 src="../../../../_static/js/docversion.js" type="text/javascript"></script>
<script type="text/javascript">
$('body').ready(function () {
$('body').css('visibility', 'visible');
});
</script>
</body>
</html>