| <!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>Distributed Key-Value Store — 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="../../_static/jquery-1.11.1.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://cdn.mathjax.org/mathjax/latest/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="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/mxnet-icon.png" rel="icon" type="image/png"/> |
| </link></link></head> |
| <body role="document"><!-- Previous Navbar Layout |
| <div class="navbar navbar-default navbar-fixed-top"> |
| <div class="container"> |
| <div class="navbar-header"> |
| <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> |
| <span class="sr-only">Toggle navigation</span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| </button> |
| <a href="../../" class="navbar-brand"> |
| <img src="http://data.mxnet.io/theme/mxnet.png"> |
| </a> |
| </div> |
| <div id="navbar" class="navbar-collapse collapse"> |
| <ul id="navbar" class="navbar navbar-left"> |
| |
| <li> <a href="../../get_started/index.html">Get Started</a> </li> |
| |
| <li> <a href="../../tutorials/index.html">Tutorials</a> </li> |
| |
| <li> <a href="../../how_to/index.html">How To</a> </li> |
| |
| |
| <li class="dropdown"> |
| <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">Packages <span class="caret"></span></a> |
| <ul class="dropdown-menu"> |
| |
| <li><a href="../../packages/python/index.html"> |
| Python |
| </a></li> |
| |
| <li><a href="../../packages/r/index.html"> |
| R |
| </a></li> |
| |
| <li><a href="../../packages/julia/index.html"> |
| Julia |
| </a></li> |
| |
| <li><a href="../../packages/c++/index.html"> |
| C++ |
| </a></li> |
| |
| <li><a href="../../packages/scala/index.html"> |
| Scala |
| </a></li> |
| |
| <li><a href="../../packages/perl/index.html"> |
| Perl |
| </a></li> |
| |
| </ul> |
| </li> |
| |
| <li> <a href="../../system/index.html">System</a> </li> |
| <li> |
| <form class="" role="search" action="../../search.html" method="get" autocomplete="off"> |
| <div class="form-group inner-addon left-addon"> |
| <i class="glyphicon glyphicon-search"></i> |
| <input type="text" name="q" class="form-control" placeholder="Search"> |
| </div> |
| <input type="hidden" name="check_keywords" value="yes" /> |
| <input type="hidden" name="area" value="default" /> |
| |
| </form> </li> |
| </ul> |
| <ul id="navbar" class="navbar navbar-right"> |
| <li> <a href="../../index.html"><span class="flag-icon flag-icon-us"></span></a> </li> |
| <li> <a href="../..//zh/index.html"><span class="flag-icon flag-icon-cn"></span></a> </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| Previous Navbar Layout End --> |
| <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="http://data.mxnet.io/theme/mxnet.png"/></a> |
| </h1> |
| <nav class="nav-bar" id="main-nav"> |
| <a class="main-nav-link" href="../../get_started/install.html">Install</a> |
| <a class="main-nav-link" href="../../tutorials/index.html">Tutorials</a> |
| <a class="main-nav-link" href="../../how_to/index.html">How To</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">API <span class="caret"></span></a> |
| <ul class="dropdown-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> |
| <a class="main-nav-link" href="../../architecture/index.html">Architecture</a> |
| <!-- <a class="main-nav-link" href="../../community/index.html">Community</a> --> |
| <a class="main-nav-link" href="https://github.com/dmlc/mxnet">Github</a> |
| <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=http://mxnet.incubator.apache.org/test/>v0.10.14</a></li><li><a class="main-nav-link" href=http://mxnet.incubator.apache.org/test/versions/0.10/index.html>0.10</a></li><li><a class="main-nav-link" href=http://mxnet.incubator.apache.org/test/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 dropdown-menu-right" id="burgerMenu"> |
| <li><a href="../../get_started/install.html">Install</a></li> |
| <li><a href="../../tutorials/index.html">Tutorials</a></li> |
| <li><a href="../../how_to/index.html">How To</a></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><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=http://mxnet.incubator.apache.org/test/>v0.10.14</a></li><li><a tabindex="-1" href=http://mxnet.incubator.apache.org/test/versions/0.10/index.html>0.10</a></li><li><a tabindex="-1" href=http://mxnet.incubator.apache.org/test/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> |
| <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="../../how_to/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="../index.html">Tutorials</a></li> |
| </ul> |
| </div> |
| </div> |
| <div class="content"> |
| <div class="section" id="distributed-key-value-store"> |
| <span id="distributed-key-value-store"></span><h1>Distributed Key-Value Store<a class="headerlink" href="#distributed-key-value-store" title="Permalink to this headline">¶</a></h1> |
| <p>KVStore is a place for data sharing. Think of it as a single object shared |
| across different devices (GPUs and computers), where each device can push data in |
| and pull data out.</p> |
| <div class="section" id="initialization"> |
| <span id="initialization"></span><h2>Initialization<a class="headerlink" href="#initialization" title="Permalink to this headline">¶</a></h2> |
| <p>Let’s consider a simple example: initializing |
| a (<code class="docutils literal"><span class="pre">int</span></code>, <code class="docutils literal"><span class="pre">NDArray</span></code>) pair into the store, and then pulling the value out:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">kv</span> <span class="o">=</span> <span class="n">mx</span><span class="o">.</span><span class="n">kv</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="s1">'local'</span><span class="p">)</span> <span class="c1"># create a local kv store.</span> |
| <span class="o">>>></span> <span class="n">shape</span> <span class="o">=</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">)</span><span class="o">*</span><span class="mi">2</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">a</span> <span class="o">=</span> <span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="n">shape</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">a</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">a</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">2.</span> <span class="mf">2.</span> <span class="mf">2.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">2.</span> <span class="mf">2.</span> <span class="mf">2.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="push-aggregate-and-update"> |
| <span id="push-aggregate-and-update"></span><h2>Push, Aggregate, and Update<a class="headerlink" href="#push-aggregate-and-update" title="Permalink to this headline">¶</a></h2> |
| <p>For any key that has been initialized, you can push a new value with the same shape to the key:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">)</span><span class="o">*</span><span class="mi">8</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">a</span><span class="p">)</span> <span class="c1"># pull out the value</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">a</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">8.</span> <span class="mf">8.</span> <span class="mf">8.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">8.</span> <span class="mf">8.</span> <span class="mf">8.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| <p>The data for pushing can be stored on any device. Furthermore, you can push multiple |
| values into the same key, where KVStore will first sum all of these |
| values and then push the aggregated value:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">gpus</span> <span class="o">=</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">gpu</span><span class="p">(</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="mi">4</span><span class="p">)]</span> |
| <span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="n">gpu</span><span class="p">)</span> <span class="k">for</span> <span class="n">gpu</span> <span class="ow">in</span> <span class="n">gpus</span><span class="p">]</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">a</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">a</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">4.</span> <span class="mf">4.</span> <span class="mf">4.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">4.</span> <span class="mf">4.</span> <span class="mf">4.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| <p>For each push, KVStore combines the pushed value with the value stored using an |
| <code class="docutils literal"><span class="pre">updater</span></code>. The default updater is <code class="docutils literal"><span class="pre">ASSIGN</span></code>. You can replace the default to |
| control how data is merged:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="nb">input</span><span class="p">,</span> <span class="n">stored</span><span class="p">):</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="s2">"update on key: </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="n">key</span> |
| <span class="o">>>></span> <span class="n">stored</span> <span class="o">+=</span> <span class="nb">input</span> <span class="o">*</span> <span class="mi">2</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">_set_updater</span><span class="p">(</span><span class="n">update</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span><span class="o">=</span><span class="n">a</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">a</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">4.</span> <span class="mf">4.</span> <span class="mf">4.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">4.</span> <span class="mf">4.</span> <span class="mf">4.</span><span class="p">]]</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">))</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">3</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span><span class="o">=</span><span class="n">a</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">a</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">6.</span> <span class="mf">6.</span> <span class="mf">6.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">6.</span> <span class="mf">6.</span> <span class="mf">6.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="pull"> |
| <span id="pull"></span><h2>Pull<a class="headerlink" href="#pull" title="Permalink to this headline">¶</a></h2> |
| <p>You’ve already seen how to pull a single key-value pair. Similarly, to push, you can |
| pull the value onto several devices with a single call:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="n">gpu</span><span class="p">)</span> <span class="k">for</span> <span class="n">gpu</span> <span class="ow">in</span> <span class="n">gpus</span><span class="p">]</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">b</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">b</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">6.</span> <span class="mf">6.</span> <span class="mf">6.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">6.</span> <span class="mf">6.</span> <span class="mf">6.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="handle-a-list-of-key-value-pairs"> |
| <span id="handle-a-list-of-key-value-pairs"></span><h2>Handle a List of Key-Value Pairs<a class="headerlink" href="#handle-a-list-of-key-value-pairs" title="Permalink to this headline">¶</a></h2> |
| <p>All operations introduced so far involve a single key. KVStore also provides |
| an interface for a list of key-value pairs.</p> |
| <p>For a single device:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">keys</span> <span class="o">=</span> <span class="p">[</span><span class="mi">5</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">9</span><span class="p">]</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="n">keys</span><span class="p">,</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">)]</span><span class="o">*</span><span class="nb">len</span><span class="p">(</span><span class="n">keys</span><span class="p">))</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="n">keys</span><span class="p">,</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">)]</span><span class="o">*</span><span class="nb">len</span><span class="p">(</span><span class="n">keys</span><span class="p">))</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">5</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">7</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">9</span> |
| <span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="p">[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="n">shape</span><span class="p">)]</span><span class="o">*</span><span class="nb">len</span><span class="p">(</span><span class="n">keys</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="n">keys</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">b</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">b</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">3.</span> <span class="mf">3.</span> <span class="mf">3.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">3.</span> <span class="mf">3.</span> <span class="mf">3.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| <p>For multiple devices:</p> |
| <div class="highlight-python"><div class="highlight"><pre><span></span> <span class="o">>>></span> <span class="n">b</span> <span class="o">=</span> <span class="p">[[</span><span class="n">mx</span><span class="o">.</span><span class="n">nd</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="n">gpu</span><span class="p">)</span> <span class="k">for</span> <span class="n">gpu</span> <span class="ow">in</span> <span class="n">gpus</span><span class="p">]]</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">keys</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="n">keys</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">5</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">7</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span><span class="p">:</span> <span class="mi">9</span> |
| <span class="o">>>></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span><span class="n">keys</span><span class="p">,</span> <span class="n">out</span> <span class="o">=</span> <span class="n">b</span><span class="p">)</span> |
| <span class="o">>>></span> <span class="k">print</span> <span class="n">b</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">asnumpy</span><span class="p">()</span> |
| <span class="p">[[</span> <span class="mf">11.</span> <span class="mf">11.</span> <span class="mf">11.</span><span class="p">]</span> |
| <span class="p">[</span> <span class="mf">11.</span> <span class="mf">11.</span> <span class="mf">11.</span><span class="p">]]</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="run-on-multiple-machines"> |
| <span id="run-on-multiple-machines"></span><h2>Run on Multiple Machines<a class="headerlink" href="#run-on-multiple-machines" title="Permalink to this headline">¶</a></h2> |
| <p>Based on parameter server, the <code class="docutils literal"><span class="pre">updater</span></code> runs on the server nodes. |
| When the distributed version is ready, we will update this section.</p> |
| <!-- ## How to Choose Between APIs --><!-- You can mix APIs as much as you like. Here are some guidelines --> |
| <!-- * Use the Symbolic API and a coarse-grained operator to create an established structure. --> |
| <!-- * Use a fine-grained operator to extend parts of a more flexible symbolic graph. --> |
| <!-- * Do some dynamic NDArray tricks, which are even more flexible, between the calls of forward and backward executors. --><!-- Different approaches offer you different levels of flexibility and --> |
| <!-- efficiency. Normally, you do not need to be flexible in all parts of the --> |
| <!-- network, so use the parts optimized for speed, and compose it --> |
| <!-- flexibly with a fine-grained operator or a dynamic NDArray. Such a --> |
| <!-- mixture allows you to build the deep learning architecture both efficiently and --> |
| <!-- flexibly as your choice. --></div> |
| <div class="section" id="next-steps"> |
| <span id="next-steps"></span><h2>Next Steps<a class="headerlink" href="#next-steps" title="Permalink to this headline">¶</a></h2> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference external" href="http://mxnet.io/tutorials/index.html">MXNet tutorials index</a></li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="container"> |
| <div class="footer"> |
| <p> © 2015-2017 DMLC. All rights reserved. </p> |
| </div> |
| </div> |
| </div> |
| <div aria-label="main navigation" class="sphinxsidebar rightsidebar" role="navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <h3><a href="../../index.html">Table Of Contents</a></h3> |
| <ul> |
| <li><a class="reference internal" href="#">Distributed Key-Value Store</a><ul> |
| <li><a class="reference internal" href="#initialization">Initialization</a></li> |
| <li><a class="reference internal" href="#push-aggregate-and-update">Push, Aggregate, and Update</a></li> |
| <li><a class="reference internal" href="#pull">Pull</a></li> |
| <li><a class="reference internal" href="#handle-a-list-of-key-value-pairs">Handle a List of Key-Value Pairs</a></li> |
| <li><a class="reference internal" href="#run-on-multiple-machines">Run on Multiple Machines</a></li> |
| <li><a class="reference internal" href="#next-steps">Next Steps</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> <!-- pagename != index --> |
| <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 type="text/javascript"> |
| $('body').ready(function () { |
| $('body').css('visibility', 'visible'); |
| }); |
| </script> |
| </div></body> |
| </html> |