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<div class="highlight"><pre><span class="lineno">3</span><span></span><span class="kn">import</span> <span class="nn">torch</span>
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<span class="lineno">4</span><span class="kn">import</span> <span class="nn">torch.nn</span> <span class="k">as</span> <span class="nn">nn</span></pre></div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">6</span><span class="k">class</span> <span class="nc">MLP</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span></pre></div>
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</div>
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<div class='docs'>
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<a href='#section-2'>#</a>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">7</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span>
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<span class="lineno">8</span> <span class="p">,</span> <span class="n">in_features</span>
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<span class="lineno">9</span> <span class="p">,</span> <span class="n">out_features</span>
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<span class="lineno">10</span> <span class="p">,</span> <span class="n">hidden_layers</span>
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<span class="lineno">11</span> <span class="p">,</span> <span class="n">actv_func</span>
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<span class="lineno">12</span> <span class="p">,</span> <span class="n">pre_module_list</span><span class="o">=</span><span class="kc">None</span>
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<span class="lineno">13</span> <span class="p">,</span> <span class="n">use_dropout</span><span class="o">=</span><span class="kc">False</span>
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<span class="lineno">14</span> <span class="p">,</span> <span class="n">use_batch_norm</span><span class="o">=</span><span class="kc">False</span>
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<span class="lineno">15</span> <span class="p">,</span> <span class="n">use_softmax</span><span class="o">=</span><span class="kc">True</span>
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<span class="lineno">16</span> <span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="s2">"cpu"</span>
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<span class="lineno">17</span> <span class="p">):</span>
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<span class="lineno">18</span> <span class="nb">super</span><span class="p">(</span><span class="n">MLP</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
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<span class="lineno">19</span>
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<span class="lineno">20</span> <span class="bp">self</span><span class="o">.</span><span class="n">in_features</span> <span class="o">=</span> <span class="n">in_features</span>
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<span class="lineno">21</span> <span class="bp">self</span><span class="o">.</span><span class="n">out_features</span> <span class="o">=</span> <span class="n">out_features</span>
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<span class="lineno">22</span> <span class="bp">self</span><span class="o">.</span><span class="n">num_hidden_layers</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">hidden_layers</span><span class="p">)</span>
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<span class="lineno">23</span> <span class="bp">self</span><span class="o">.</span><span class="n">hidden_layers</span> <span class="o">=</span> <span class="n">hidden_layers</span>
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<span class="lineno">24</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_dropout</span> <span class="o">=</span> <span class="n">use_dropout</span>
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<span class="lineno">25</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_batch_norm</span> <span class="o">=</span> <span class="n">use_batch_norm</span>
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<span class="lineno">26</span> <span class="bp">self</span><span class="o">.</span><span class="n">actv_func</span> <span class="o">=</span> <span class="n">actv_func</span>
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<span class="lineno">27</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_softmax</span> <span class="o">=</span> <span class="n">use_softmax</span>
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<span class="lineno">28</span>
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<span class="lineno">29</span> <span class="bp">self</span><span class="o">.</span><span class="n">device</span> <span class="o">=</span> <span class="n">device</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-3'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-3'>#</a>
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</div>
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<p>Add on to another model</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">32</span> <span class="k">if</span> <span class="n">pre_module_list</span><span class="p">:</span>
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<span class="lineno">33</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span> <span class="o">=</span> <span class="n">pre_module_list</span>
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<span class="lineno">34</span> <span class="k">else</span><span class="p">:</span>
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<span class="lineno">35</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">ModuleList</span><span class="p">()</span>
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<span class="lineno">36</span>
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<span class="lineno">37</span> <span class="bp">self</span><span class="o">.</span><span class="n">build_</span><span class="p">()</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-4'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-4'>#</a>
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</div>
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<p>Send to gpu</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">40</span> <span class="bp">self</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">device</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-5'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-5'>#</a>
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</div>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">42</span> <span class="k">def</span> <span class="nf">build_</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-6'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-6'>#</a>
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</div>
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<p>Activation Functions for Fully connected layers #
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Start with input dimensions</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">45</span> <span class="n">dim</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">in_features</span>
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<span class="lineno">46</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">num_hidden_layers</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-7'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-7'>#</a>
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</div>
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<p>Create a fully connected layer between the last layer
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and the current hidden layer</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">49</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="n">dim</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">hidden_layers</span><span class="p">[</span><span class="n">i</span><span class="p">]))</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-8'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-8'>#</a>
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</div>
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<p>Update the current dimension</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">51</span> <span class="n">dim</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">hidden_layers</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
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<span class="lineno">52</span>
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<span class="lineno">53</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_batch_norm</span><span class="p">:</span>
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<span class="lineno">54</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="n">nn</span><span class="o">.</span><span class="n">BatchNorm1d</span><span class="p">(</span><span class="n">dim</span><span class="p">,</span> <span class="n">affine</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span> <span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-9'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-9'>#</a>
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</div>
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<p>Add the Activation function</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">57</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="bp">self</span><span class="o">.</span><span class="n">GetActivation</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">actv_func</span><span class="p">[</span><span class="n">i</span><span class="p">])</span> <span class="p">)</span>
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<span class="lineno">58</span>
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<span class="lineno">59</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_dropout</span><span class="p">:</span>
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<span class="lineno">60</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="n">nn</span><span class="o">.</span><span class="n">Dropout</span><span class="p">(</span><span class="n">p</span><span class="o">=</span><span class="mf">0.10</span><span class="p">)</span> <span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-10'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-10'>#</a>
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</div>
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<p>Fully connect to output dimensions</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">63</span> <span class="k">if</span> <span class="n">dim</span> <span class="o">!=</span> <span class="bp">self</span><span class="o">.</span><span class="n">out_features</span><span class="p">:</span>
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<span class="lineno">64</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="n">dim</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">out_features</span><span class="p">)</span> <span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-11'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-11'>#</a>
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</div>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">67</span> <span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-12'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-12'>#</a>
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</div>
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<p>Flatten the 2d image into 1d
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Also convert into float for FC layer</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">70</span> <span class="n">x</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">flatten</span><span class="p">(</span><span class="n">x</span><span class="o">.</span><span class="n">float</span><span class="p">(),</span> <span class="n">start_dim</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-13'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-13'>#</a>
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</div>
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<p>Apply each layer in the module list</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">73</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="p">)</span> <span class="p">):</span>
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<span class="lineno">74</span> <span class="n">x</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">module_list</span><span class="p">[</span><span class="n">i</span><span class="p">](</span><span class="n">x</span><span class="p">)</span>
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<span class="lineno">75</span>
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<span class="lineno">76</span> <span class="k">return</span> <span class="n">x</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-14'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-14'>#</a>
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</div>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">78</span> <span class="k">def</span> <span class="nf">GetActivation</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">"relu"</span><span class="p">):</span>
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<span class="lineno">79</span> <span class="k">if</span> <span class="n">name</span> <span class="o">==</span> <span class="s2">"relu"</span><span class="p">:</span>
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<span class="lineno">80</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">ReLU</span><span class="p">()</span>
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<span class="lineno">81</span> <span class="k">elif</span> <span class="n">name</span> <span class="o">==</span> <span class="s2">"leakyrelu"</span><span class="p">:</span>
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<span class="lineno">82</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">LeakyReLU</span><span class="p">()</span>
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<span class="lineno">83</span> <span class="k">elif</span> <span class="n">name</span> <span class="o">==</span> <span class="s2">"Sigmoid"</span><span class="p">:</span>
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<span class="lineno">84</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">Sigmoid</span><span class="p">()</span>
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<span class="lineno">85</span> <span class="k">elif</span> <span class="n">name</span> <span class="o">==</span> <span class="s2">"Tanh"</span><span class="p">:</span>
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<span class="lineno">86</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">Tanh</span><span class="p">()</span>
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<span class="lineno">87</span> <span class="k">elif</span> <span class="n">name</span> <span class="o">==</span> <span class="s2">"Identity"</span><span class="p">:</span>
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<span class="lineno">88</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">Identity</span><span class="p">()</span>
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<span class="lineno">89</span> <span class="k">else</span><span class="p">:</span>
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<span class="lineno">90</span> <span class="k">return</span> <span class="n">nn</span><span class="o">.</span><span class="n">ReLU</span><span class="p">()</span></pre></div>
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