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| <h1 id="ndarray-api">NDArray API</h1> |
| |
| <h2 id="overview">Overview</h2> |
| |
| <p>A <code>AI::MXNet::NDArray</code> is a multidimensional container of items of the same type and |
| size. Various methods for data manipulation and computation are provided.</p> |
| <div class="highlight"><pre><code class="language-perl" data-lang="perl"><span class="nv">pdl</span><span class="o">></span> <span class="nv">$x</span> <span class="o">=</span> <span class="nv">mx</span><span class="o">-></span><span class="nv">nd</span><span class="o">-></span><span class="nv">array</span><span class="p">([[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">],</span> <span class="p">[</span><span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">]])</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">print</span> <span class="nv">$x</span><span class="o">-></span><span class="nv">aspdl</span><span class="o">-></span><span class="nv">shape</span> |
| <span class="p">[</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">]</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="nv">$y</span> <span class="o">=</span> <span class="nv">$x</span> <span class="o">+</span> <span class="nv">mx</span><span class="o">-></span><span class="nv">nd</span><span class="o">-></span><span class="nv">ones</span><span class="p">(</span><span class="nv">$x</span><span class="o">-></span><span class="nv">shape</span><span class="p">)</span><span class="o">*</span><span class="mi">3</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">print</span> <span class="nv">$y</span><span class="o">-></span><span class="nv">aspdl</span> |
| <span class="p">[</span> |
| <span class="p">[</span><span class="mi">4</span> <span class="mi">5</span> <span class="mi">6</span><span class="p">]</span> |
| <span class="p">[</span><span class="mi">7</span> <span class="mi">8</span> <span class="mi">9</span><span class="p">]</span> |
| <span class="p">]</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="nv">$z</span> <span class="o">=</span> <span class="nv">$y</span><span class="o">-></span><span class="nv">as_in_context</span><span class="p">(</span><span class="nv">mx</span><span class="o">-></span><span class="nv">gpu</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">print</span> <span class="nv">$z</span><span class="p">,"</span><span class="se">\n</span><span class="p">"</span> |
| <span class="o"><</span><span class="nn">AI::MXNet::</span><span class="nv">NDArray</span> <span class="mi">2</span><span class="nv">x3</span> <span class="nv">@gpu</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">></span> |
| </code></pre></div> |
| <p>A detailed tutorial is available at |
| <a href="https://mxnet.io/tutorials/basic/ndarray.html">https://mxnet.io/tutorials/basic/ndarray.html</a>.</p> |
| |
| <p>Note: AI::MXNet::NDarray is similar to numpy.ndarray in some aspects. But the difference is not negligible. For example</p> |
| |
| <ul> |
| <li>AI::MXNet::NDArray->T does real data transpose to return new a copied array, instead |
| of returning a view of the input array.</li> |
| <li>AI::MXNet::NDArray->dot performs dot between the last axis of the first input array |
| and the first axis of the second input, while numpy.dot uses the second |
| last axis of the input array.</li> |
| </ul> |
| |
| <p>In additional, NDArray supports GPU computation and various neural |
| network layers.</p> |
| |
| <p>AI::MXNet::NDarray also provides almost same routines as AI::MXNet::symbol. Most |
| routines between these two packages share the same C++ operator source |
| codes. But AI::MXNet::NDarray differs from AI::MXNet::Symbol in several aspects:</p> |
| |
| <ul> |
| <li>AI::MXNet::NDArray adopts imperative programming, namely sentences are executed |
| step-by-step so that the results can be obtained immediately.</li> |
| </ul> |
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