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| |
| <h1 id="kvstore-api">KVStore API</h1> |
| |
| <p>Topics: |
| * <a href="#basic-push-and-pull">Basic Push and Pull</a> |
| * <a href="#list-key-value-pairs">List Key-Value Pairs</a> |
| * <a href="/versions/1.9.1/api/scala/docs/api/#org.apache.mxnet.KVStore">API Reference</a></p> |
| |
| <h2 id="basic-push-and-pull">Basic Push and Pull</h2> |
| |
| <p>Provides basic operation over multiple devices (GPUs) on a single device.</p> |
| |
| <h3 id="initialization">Initialization</h3> |
| |
| <p>Let's consider a simple example. It initializes |
| a (<code>int</code>, <code>NDArray</code>) pair into the store, and then pulls the value out.</p> |
| <div class="highlight"><pre><code class="language-scala" data-lang="scala"><span class="k">val</span> <span class="nv">kv</span> <span class="k">=</span> <span class="nv">KVStore</span><span class="o">.</span><span class="py">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="k">val</span> <span class="nv">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="nv">kv</span><span class="o">.</span><span class="py">init</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">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="k">val</span> <span class="nv">a</span> <span class="k">=</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">zeros</span><span class="o">(</span><span class="n">shape</span><span class="o">)</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">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="nv">a</span><span class="o">.</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(2.0, 2.0, 2.0, 2.0, 2.0, 2.0) |
| </span></code></pre></div> |
| <h3 id="push-aggregation-and-updater">Push, Aggregation, and Updater</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"><pre><code class="language-scala" data-lang="scala"><span class="nv">kv</span><span class="o">.</span><span class="py">push</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">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="nv">kv</span><span class="o">.</span><span class="py">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="nv">a</span><span class="o">.</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(8.0, 8.0, 8.0, 8.0, 8.0, 8.0) |
| </span></code></pre></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"><pre><code class="language-scala" data-lang="scala"><span class="k">val</span> <span class="nv">gpus</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nv">Context</span><span class="o">.</span><span class="py">gpu</span><span class="o">(</span><span class="mi">0</span><span class="o">),</span> <span class="nv">Context</span><span class="o">.</span><span class="py">gpu</span><span class="o">(</span><span class="mi">1</span><span class="o">),</span> <span class="nv">Context</span><span class="o">.</span><span class="py">gpu</span><span class="o">(</span><span class="mi">2</span><span class="o">),</span> <span class="nv">Context</span><span class="o">.</span><span class="py">gpu</span><span class="o">(</span><span class="mi">3</span><span class="o">))</span> |
| <span class="k">val</span> <span class="nv">b</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">0</span><span class="o">)),</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">1</span><span class="o">)),</span> <span class="o">\</span> |
| <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">2</span><span class="o">)),</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">3</span><span class="o">)))</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">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="nv">kv</span><span class="o">.</span><span class="py">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="nv">a</span><span class="o">.</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(4.0, 4.0, 4.0, 4.0, 4.0, 4.0) |
| </span></code></pre></div> |
| <p>For each push command, KVStore applies the pushed value to the value stored by an |
| <code>updater</code>. The default updater is <code>ASSIGN</code>. You can replace the default to |
| control how data is merged.</p> |
| <div class="highlight"><pre><code class="language-scala" data-lang="scala"><span class="k">val</span> <span class="nv">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="nf">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="nf">println</span><span class="o">(</span><span class="n">s</span><span class="s">"update on key $key"</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="nf">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="nv">kv</span><span class="o">.</span><span class="py">setUpdater</span><span class="o">(</span><span class="n">updater</span><span class="o">)</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">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="nv">a</span><span class="o">.</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(4.0, 4.0, 4.0, 4.0, 4.0, 4.0) |
| </span><span class="nv">kv</span><span class="o">.</span><span class="py">push</span><span class="o">(</span><span class="mi">3</span><span class="o">,</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">))</span> |
| <span class="c1">// update on key 3 |
| </span><span class="nv">kv</span><span class="o">.</span><span class="py">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="nv">a</span><span class="o">.</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(6.0, 6.0, 6.0, 6.0, 6.0, 6.0) |
| </span></code></pre></div> |
| <h3 id="pull">Pull</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"><pre><code class="language-scala" data-lang="scala"><span class="k">val</span> <span class="nv">b</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">0</span><span class="o">)),</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">1</span><span class="o">)),\</span> |
| <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">2</span><span class="o">)),</span> <span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">,</span> <span class="nf">gpus</span><span class="o">(</span><span class="mi">3</span><span class="o">)))</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">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="nf">b</span><span class="o">(</span><span class="mi">1</span><span class="o">).</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(6.0, 6.0, 6.0, 6.0, 6.0, 6.0) |
| </span></code></pre></div> |
| <h2 id="list-key-value-pairs">List Key-Value Pairs</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"><pre><code class="language-scala" data-lang="scala"><span class="k">val</span> <span class="nv">keys</span> <span class="k">=</span> <span class="nc">Array</span><span class="o">(</span><span class="mi">5</span><span class="o">,</span> <span class="mi">7</span><span class="o">,</span> <span class="mi">9</span><span class="o">)</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">init</span><span class="o">(</span><span class="n">keys</span><span class="o">,</span> <span class="nv">Array</span><span class="o">.</span><span class="py">fill</span><span class="o">(</span><span class="nv">keys</span><span class="o">.</span><span class="py">length</span><span class="o">)(</span><span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">)))</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">push</span><span class="o">(</span><span class="n">keys</span><span class="o">,</span> <span class="nv">Array</span><span class="o">.</span><span class="py">fill</span><span class="o">(</span><span class="nv">keys</span><span class="o">.</span><span class="py">length</span><span class="o">)(</span><span class="nv">NDArray</span><span class="o">.</span><span class="py">ones</span><span class="o">(</span><span class="n">shape</span><span class="o">)))</span> |
| <span class="c1">// update on key: 5 |
| // update on key: 7 |
| // update on key: 9 |
| </span><span class="k">val</span> <span class="nv">b</span> <span class="k">=</span> <span class="nv">Array</span><span class="o">.</span><span class="py">fill</span><span class="o">(</span><span class="nv">keys</span><span class="o">.</span><span class="py">length</span><span class="o">)(</span><span class="nv">NDArray</span><span class="o">.</span><span class="py">zeros</span><span class="o">(</span><span class="n">shape</span><span class="o">))</span> |
| <span class="nv">kv</span><span class="o">.</span><span class="py">pull</span><span class="o">(</span><span class="n">keys</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="nf">b</span><span class="o">(</span><span class="mi">1</span><span class="o">).</span><span class="py">toArray</span> |
| <span class="c1">// Array[Float] = Array(3.0, 3.0, 3.0, 3.0, 3.0, 3.0) |
| </span></code></pre></div></div> |
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