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| <div class="section" id="kvstore-api"> |
| <span id="kvstore-api"></span><h1>KVStore API<a class="headerlink" href="#kvstore-api" title="Permalink to this headline">¶</a></h1> |
| <p>Topics:</p> |
| <ul class="simple"> |
| <li><a class="reference external" href="#basic-push-and-pull">Basic Push and Pull</a></li> |
| <li><a class="reference external" href="#list-key-value-pairs">List Key-Value Pairs</a></li> |
| <li><a class="reference external" href="http://mxnet.io/api/scala/docs/index.html#ml.dmlc.mxnet.KVStore">API Reference</a></li> |
| </ul> |
| <div class="section" id="basic-push-and-pull"> |
| <span id="basic-push-and-pull"></span><h2>Basic Push and Pull<a class="headerlink" href="#basic-push-and-pull" title="Permalink to this headline">¶</a></h2> |
| <p>Provides basic operation over multiple devices (GPUs) on a single device.</p> |
| <div class="section" id="initialization"> |
| <span id="initialization"></span><h3>Initialization<a class="headerlink" href="#initialization" title="Permalink to this headline">¶</a></h3> |
| <p>Let’s consider a simple example. It initializes |
| 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 pulls the value out.</p> |
| <div class="highlight-scala"><div class="highlight"><pre><span></span> <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">kv</span> <span class="k">=</span> <span class="nc">KVStore</span><span class="o">.</span><span class="n">create</span><span class="o">(</span><span class="s">"local"</span><span class="o">)</span> <span class="c1">// create a local kv store.</span> |
| <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">shape</span> <span class="k">=</span> <span class="nc">Shape</span><span class="o">(</span><span class="mi">2</span><span class="o">,</span><span class="mi">3</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">init</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">)*</span><span class="mi">2</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">a</span> <span class="k">=</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">zeros</span><span class="o">(</span><span class="n">shape</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">out</span> <span class="k">=</span> <span class="n">a</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">a</span><span class="o">.</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">2.0</span><span class="o">,</span> <span class="mf">2.0</span><span class="o">,</span> <span class="mf">2.0</span><span class="o">,</span> <span class="mf">2.0</span><span class="o">,</span> <span class="mf">2.0</span><span class="o">,</span> <span class="mf">2.0</span><span class="o">)</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="push-aggregation-and-updater"> |
| <span id="push-aggregation-and-updater"></span><h3>Push, Aggregation, and Updater<a class="headerlink" href="#push-aggregation-and-updater" title="Permalink to this headline">¶</a></h3> |
| <p>For any key that’s been initialized, you can push a new value with the same shape to the key, as follows:</p> |
| <div class="highlight-scala"><div class="highlight"><pre><span></span> <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">)*</span><span class="mi">8</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">out</span> <span class="k">=</span> <span class="n">a</span><span class="o">)</span> <span class="c1">// pull out the value</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">a</span><span class="o">.</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">8.0</span><span class="o">,</span> <span class="mf">8.0</span><span class="o">,</span> <span class="mf">8.0</span><span class="o">,</span> <span class="mf">8.0</span><span class="o">,</span> <span class="mf">8.0</span><span class="o">,</span> <span class="mf">8.0</span><span class="o">)</span> |
| </pre></div> |
| </div> |
| <p>The data that you want to push can be stored on any device. Furthermore, you can push multiple |
| values into the same key, where KVStore first sums all of these |
| values, and then pushes the aggregated value, as follows:</p> |
| <div class="highlight-scala"><div class="highlight"><pre><span></span> <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">gpus</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nc">Context</span><span class="o">.</span><span class="n">gpu</span><span class="o">(</span><span class="mi">0</span><span class="o">),</span> <span class="nc">Context</span><span class="o">.</span><span class="n">gpu</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="nc">Context</span><span class="o">.</span><span class="n">gpu</span><span class="o">(</span><span class="mi">2</span><span class="o">),</span> <span class="nc">Context</span><span class="o">.</span><span class="n">gpu</span><span class="o">(</span><span class="mi">3</span><span class="o">))</span> |
| <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">b</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">0</span><span class="o">)),</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">1</span><span class="o">)),</span> <span class="o">\</span> |
| <span class="n">scala</span><span class="o">></span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">2</span><span class="o">)),</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">3</span><span class="o">)))</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">b</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">out</span> <span class="k">=</span> <span class="n">a</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">a</span><span class="o">.</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">)</span> |
| </pre></div> |
| </div> |
| <p>For each push command, KVStore applies the pushed value to the value stored by 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-scala"><div class="highlight"><pre><span></span> <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">updater</span> <span class="k">=</span> <span class="k">new</span> <span class="nc">MXKVStoreUpdater</span> <span class="o">{</span> |
| <span class="k">override</span> <span class="k">def</span> <span class="n">update</span><span class="o">(</span><span class="n">key</span><span class="k">:</span> <span class="kt">Int</span><span class="o">,</span> <span class="n">input</span><span class="k">:</span> <span class="kt">NDArray</span><span class="o">,</span> <span class="n">stored</span><span class="k">:</span> <span class="kt">NDArray</span><span class="o">)</span><span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span> |
| <span class="n">println</span><span class="o">(</span><span class="s">s"update on key </span><span class="si">$key</span><span class="s">"</span><span class="o">)</span> |
| <span class="n">stored</span> <span class="o">+=</span> <span class="n">input</span> <span class="o">*</span> <span class="mi">2</span> |
| <span class="o">}</span> |
| <span class="k">override</span> <span class="k">def</span> <span class="n">dispose</span><span class="o">()</span><span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{}</span> |
| <span class="o">}</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">setUpdater</span><span class="o">(</span><span class="n">updater</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">a</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">a</span><span class="o">.</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">,</span> <span class="mf">4.0</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">push</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">))</span> |
| <span class="n">update</span> <span class="n">on</span> <span class="n">key</span> <span class="mi">3</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">a</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">a</span><span class="o">.</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">)</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="pull"> |
| <span id="pull"></span><h3>Pull<a class="headerlink" href="#pull" title="Permalink to this headline">¶</a></h3> |
| <p>You’ve already seen how to pull a single key-value pair. Similar to the way that you use the push command, you can |
| pull the value into several devices with a single call.</p> |
| <div class="highlight-scala"><div class="highlight"><pre><span></span> <span class="n">scala</span><span class="o">></span> <span class="k">val</span> <span class="n">b</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">0</span><span class="o">)),</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">1</span><span class="o">)),\</span> |
| <span class="n">scala</span><span class="o">></span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">2</span><span class="o">)),</span> <span class="nc">NDArray</span><span class="o">.</span><span class="n">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="n">gpus</span><span class="o">(</span><span class="mi">3</span><span class="o">)))</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">kv</span><span class="o">.</span><span class="n">pull</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="n">outs</span> <span class="k">=</span> <span class="n">b</span><span class="o">)</span> |
| <span class="n">scala</span><span class="o">></span> <span class="n">b</span><span class="o">(</span><span class="mi">1</span><span class="o">).</span><span class="n">toArray</span> |
| <span class="nc">Array</span><span class="o">[</span><span class="kt">Float</span><span class="o">]</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">,</span> <span class="mf">6.0</span><span class="o">)</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="list-key-value-pairs"> |
| <span id="list-key-value-pairs"></span><h2>List Key-Value Pairs<a class="headerlink" href="#list-key-value-pairs" title="Permalink to this headline">¶</a></h2> |
| <p>All of the operations that we’ve discussed so far are performed on a single key. KVStore also provides |
| the interface for generating a list of key-value pairs. For a single device, use the following:</p> |
| <div class="highlight-scala"><div class="highlight"><pre><span></span> scala> val keys = Array(5, 7, 9) |
| scala> kv.init(keys, Array.fill(keys.length)(NDArray.ones(shape))) |
| scala> kv.push(keys, Array.fill(keys.length)(NDArray.ones(shape))) |
| update on key: 5 |
| update on key: 7 |
| update on key: 9 |
| scala> val b = Array.fill(keys.length)(NDArray.zeros(shape)) |
| scala> kv.pull(keys, outs = b) |
| scala> b(1).toArray |
| Array[Float] = Array(3.0, 3.0, 3.0, 3.0, 3.0, 3.0) |
| </pre></div> |
| </div> |
| </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#Python-Tutorials">Scala Tutorials</a></li> |
| </ul> |
| </div> |
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| <p> © 2015-2017 DMLC. All rights reserved. </p> |
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| <h3><a href="../../index.html">Table Of Contents</a></h3> |
| <ul> |
| <li><a class="reference internal" href="#">KVStore API</a><ul> |
| <li><a class="reference internal" href="#basic-push-and-pull">Basic Push and Pull</a><ul> |
| <li><a class="reference internal" href="#initialization">Initialization</a></li> |
| <li><a class="reference internal" href="#push-aggregation-and-updater">Push, Aggregation, and Updater</a></li> |
| <li><a class="reference internal" href="#pull">Pull</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#list-key-value-pairs">List Key-Value Pairs</a></li> |
| <li><a class="reference internal" href="#next-steps">Next Steps</a></li> |
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