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| <h1 class="post-title">Data Loading API</h1> |
| <h3></h3></header> |
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| |
| <h1 id="data-loading-api">Data Loading API</h1> |
| |
| <h2 id="overview">Overview</h2> |
| |
| <p>A data iterator reads data batch by batch.</p> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">pdl</span><span class="o">></span> <span class="nv">$data</span> <span class="o">=</span> <span class="nv">mx</span><span class="o">-></span><span class="nv">nd</span><span class="o">-></span><span class="nv">ones</span><span class="p">([</span><span class="mi">100</span><span class="p">,</span><span class="mi">10</span><span class="p">])</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="nv">$nd_iter</span> <span class="o">=</span> <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">NDArrayIter</span><span class="p">(</span><span class="nv">$data</span><span class="p">,</span> <span class="nv">batch_size</span><span class="o">=></span><span class="mi">25</span><span class="p">)</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">for</span> <span class="k">my</span> <span class="nv">$batch</span> <span class="p">(</span><span class="nv">@</span><span class="p">{</span> <span class="nv">$nd_iter</span> <span class="p">})</span> <span class="p">{</span> <span class="k">print</span> <span class="nv">$batch</span><span class="o">-></span><span class="nv">data</span><span class="o">-></span><span class="p">[</span><span class="mi">0</span><span class="p">],"</span><span class="se">\n</span><span class="p">"</span> <span class="p">}</span> |
| <span class="o"><</span><span class="nn">AI::MXNet::</span><span class="nv">NDArray</span> <span class="mi">25</span><span class="nv">x10</span> <span class="nv">@cpu</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">></span> |
| <span class="o"><</span><span class="nn">AI::MXNet::</span><span class="nv">NDArray</span> <span class="mi">25</span><span class="nv">x10</span> <span class="nv">@cpu</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">></span> |
| <span class="o"><</span><span class="nn">AI::MXNet::</span><span class="nv">NDArray</span> <span class="mi">25</span><span class="nv">x10</span> <span class="nv">@cpu</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">></span> |
| <span class="o"><</span><span class="nn">AI::MXNet::</span><span class="nv">NDArray</span> <span class="mi">25</span><span class="nv">x10</span> <span class="nv">@cpu</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">></span> |
| </code></pre></div></div> |
| |
| <p>If <code class="highlighter-rouge">$nd_iter->reset()</code> is called, then reads the data again from beginning.</p> |
| |
| <p>In addition, an iterator provides information about the batch, including the |
| shapes and name.</p> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">pdl</span><span class="o">></span> <span class="nv">$nd_iter</span> <span class="o">=</span> <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">NDArrayIter</span><span class="p">(</span><span class="nv">data</span><span class="o">=></span><span class="p">{</span><span class="nv">data</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="mi">100</span><span class="p">,</span><span class="mi">10</span><span class="p">])},</span> <span class="nv">label</span><span class="o">=></span><span class="p">{</span><span class="nv">softmax_label</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="mi">100</span><span class="p">])},</span> <span class="nv">batch_size</span><span class="o">=></span><span class="mi">25</span><span class="p">)</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">print</span><span class="p">(</span><span class="nv">$nd_iter</span><span class="o">-></span><span class="nv">provide_data</span><span class="o">-></span><span class="p">[</span><span class="mi">0</span><span class="p">],"</span><span class="se">\n</span><span class="p">")</span> |
| <span class="nv">DataDesc</span><span class="p">[</span><span class="nv">data</span><span class="p">,</span><span class="mi">25</span><span class="nv">x10</span><span class="p">,</span><span class="nv">float32</span><span class="p">,</span><span class="nv">NCHW</span><span class="p">]</span> |
| <span class="nv">pdl</span><span class="o">></span> <span class="k">print</span><span class="p">(</span><span class="nv">$nd_iter</span><span class="o">-></span><span class="nv">provide_label</span><span class="o">-></span><span class="p">[</span><span class="mi">0</span><span class="p">],"</span><span class="se">\n</span><span class="p">")</span> |
| <span class="nv">DataDesc</span><span class="p">[</span><span class="nv">softmax_label</span><span class="p">,</span><span class="mi">25</span><span class="p">,</span><span class="nv">float32</span><span class="p">,</span><span class="nv">NCHW</span><span class="p">]</span> |
| </code></pre></div></div> |
| |
| <p>So this iterator can be used to train a symbol whose input data variable has |
| name <code class="highlighter-rouge">data</code> and input label variable has name <code class="highlighter-rouge">softmax_label</code>.</p> |
| |
| <h2 id="predefined-data-iterators">Predefined Data iterators</h2> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">NDArrayIter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">CSVIter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">ImageRecordIter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">ImageRecordInt8Iter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">ImageRecordUInt8Iter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">io</span><span class="o">-></span><span class="nv">MNISTIter</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">recordio</span><span class="o">-></span><span class="nv">MXRecordIO</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">recordio</span><span class="o">-></span><span class="nv">MXIndexedRecordIO</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">ImageIter</span> |
| </code></pre></div></div> |
| |
| <h2 id="helper-classes-and-functions">Helper classes and functions</h2> |
| |
| <p>Data structures and other iterators provided in the <code class="highlighter-rouge">AI::MXNet::IO</code> package.</p> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nn">AI::MXNet::</span><span class="nv">DataDesc</span> |
| <span class="nn">AI::MXNet::</span><span class="nv">DataBatch</span> |
| <span class="nn">AI::MXNet::</span><span class="nv">DataIter</span> |
| <span class="nn">AI::MXNet::</span><span class="nv">ResizeIter</span> |
| <span class="nn">AI::MXNet::</span><span class="nv">MXDataIter</span> |
| </code></pre></div></div> |
| |
| <p>A list of image modification functions provided by <code class="highlighter-rouge">AI::MXNet::Image</code>.</p> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">imdecode</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">scale_down</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">resize_short</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">fixed_crop</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">random_crop</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">center_crop</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">color_normalize</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">random_size_crop</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">ResizeAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">RandomCropAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">RandomSizedCropAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">CenterCropAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">RandomOrderAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">ColorJitterAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">LightingAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">ColorNormalizeAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">HorizontalFlipAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">CastAug</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">image</span><span class="o">-></span><span class="nv">CreateAugmenter</span> |
| </code></pre></div></div> |
| |
| <p>Functions to read and write RecordIO files.</p> |
| |
| <div class="language-perl highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">mx</span><span class="o">-></span><span class="nv">recordio</span><span class="o">-></span><span class="nb">pack</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">recordio</span><span class="o">-></span><span class="nb">unpack</span> |
| <span class="nv">mx</span><span class="o">-></span><span class="nv">recordio</span><span class="o">-></span><span class="nv">unpack_img</span> |
| </code></pre></div></div> |
| |
| <h2 id="develop-a-new-iterator">Develop a new iterator</h2> |
| |
| <p>Writing a new data iterator in Perl is straightforward. Most MXNet |
| training/inference programs accept an object with <code class="highlighter-rouge">provide_data</code> |
| and <code class="highlighter-rouge">provide_label</code> properties. |
| Please refer to AI-MXNet/examples for the examples of custom iterators.</p> |
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