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<p>Convolution neural network (CNN) is a type of feed-forward neural network widely used for image and video classification. In this example, we will use a <a href="http://papers.nips.cc/paper/4824-imagenet-classification-with-deep-convolutional-neural-networks">deep CNN model</a> to do image classification against the ImageNet dataset.</p>
<h2><a class="anchor" aria-hidden="true" id="instructions"></a><a href="#instructions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Instructions</h2>
<h3><a class="anchor" aria-hidden="true" id="compile-singa"></a><a href="#compile-singa" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Compile SINGA</h3>
<p>Please compile SINGA with CUDA, CUDNN and OpenCV. You can manually turn on the options in CMakeLists.txt or run <code>ccmake ..</code> in <code>build/</code> folder.</p>
<p>We have tested CUDNN V4 and V5 (V5 requires CUDA 7.5)</p>
<h3><a class="anchor" aria-hidden="true" id="data-download"></a><a href="#data-download" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data download</h3>
<ul>
<li>Please refer to step1-3 on <a href="https://github.com/amd/OpenCL-caffe/wiki/Instructions-to-create-ImageNet-2012-data">Instructions to create ImageNet 2012 data</a> to download and decompress the data.</li>
<li>You can download the training and validation list by <a href="https://github.com/BVLC/caffe/blob/master/data/ilsvrc12/get_ilsvrc_aux.sh">get_ilsvrc_aux.sh</a> or from <a href="http://www.image-net.org/download-images">Imagenet</a>.</li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="data-preprocessing"></a><a href="#data-preprocessing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Data preprocessing</h3>
<blockquote>
<p>Please <code>cd</code> to <code>singa/examples/imagenet/alexnet/</code> for the following commands</p>
</blockquote>
<ul>
<li><p>Assuming you have downloaded the data and the list. Now we should transform the data into binary files. You can run:</p>
<pre><code class="hljs css language-shell">sh create_data.sh
</code></pre>
<p>The script will generate a test file(<code>test.bin</code>), a mean file(<code>mean.bin</code>) and several training files(<code>trainX.bin</code>) in the specified output folder.</p></li>
<li><p>You can also change the parameters in <code>create_data.sh</code>.</p>
<ul>
<li><code>-trainlist &lt;file&gt;</code>: the file of training list;</li>
<li><code>-trainfolder &lt;folder&gt;</code>: the folder of training images;</li>
<li><code>-testlist &lt;file&gt;</code>: the file of test list;</li>
<li><code>-testfolder &lt;floder&gt;</code>: the folder of test images;</li>
<li><code>-outdata &lt;folder&gt;</code>: the folder to save output files, including mean, training and test files. The script will generate these files in the specified folder;</li>
<li><code>-filesize &lt;int&gt;</code>: number of training images that stores in each binary file.</li>
</ul></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="training"></a><a href="#training" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Training</h3>
<ul>
<li><p>After preparing data, you can run the following command to train the Alexnet model.</p>
<pre><code class="hljs css language-shell">sh run.sh
</code></pre></li>
<li><p>You may change the parameters in <code>run.sh</code>.</p>
<ul>
<li><code>-epoch &lt;int&gt;</code>: number of epoch to be trained, default is 90;</li>
<li><code>-lr &lt;float&gt;</code>: base learning rate, the learning rate will decrease each 20 epochs, more specifically, <code>lr = lr * exp(0.1 * (epoch / 20))</code>;</li>
<li><code>-batchsize &lt;int&gt;</code>: batchsize, it should be changed regarding to your memory;</li>
<li><code>-filesize &lt;int&gt;</code>: number of training images that stores in each binary file, it is the same as the <code>filesize</code> in data preprocessing;</li>
<li><code>-ntrain &lt;int&gt;</code>: number of training images;</li>
<li><code>-ntest &lt;int&gt;</code>: number of test images;</li>
<li><code>-data &lt;folder&gt;</code>: the folder which stores the binary files, it is exactly the output folder in data preprocessing step;</li>
<li><code>-pfreq &lt;int&gt;</code>: the frequency(in batch) of printing current model status(loss and accuracy);</li>
<li><code>-nthreads &lt;int&gt;</code>: the number of threads to load data which feed to the model.</li>
</ul></li>
</ul>
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