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|                     View code on Github</a>
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|                 <a href='#section-0'>#</a>
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|             </div>
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|             <h1>MNIST 实验</h1>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">11</span><span></span><span class="kn">import</span> <span class="nn">torch.nn</span> <span class="k">as</span> <span class="nn">nn</span>
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| <span class="lineno">12</span><span class="kn">import</span> <span class="nn">torch.utils.data</span>
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| <span class="lineno">13</span><span class="kn">from</span> <span class="nn">labml_helpers.module</span> <span class="kn">import</span> <span class="n">Module</span>
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| <span class="lineno">14</span>
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| <span class="lineno">15</span><span class="kn">from</span> <span class="nn">labml</span> <span class="kn">import</span> <span class="n">tracker</span>
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| <span class="lineno">16</span><span class="kn">from</span> <span class="nn">labml.configs</span> <span class="kn">import</span> <span class="n">option</span>
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| <span class="lineno">17</span><span class="kn">from</span> <span class="nn">labml_helpers.datasets.mnist</span> <span class="kn">import</span> <span class="n">MNISTConfigs</span> <span class="k">as</span> <span class="n">MNISTDatasetConfigs</span>
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| <span class="lineno">18</span><span class="kn">from</span> <span class="nn">labml_helpers.device</span> <span class="kn">import</span> <span class="n">DeviceConfigs</span>
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| <span class="lineno">19</span><span class="kn">from</span> <span class="nn">labml_helpers.metrics.accuracy</span> <span class="kn">import</span> <span class="n">Accuracy</span>
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| <span class="lineno">20</span><span class="kn">from</span> <span class="nn">labml_helpers.train_valid</span> <span class="kn">import</span> <span class="n">TrainValidConfigs</span><span class="p">,</span> <span class="n">BatchIndex</span><span class="p">,</span> <span class="n">hook_model_outputs</span>
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| <span class="lineno">21</span><span class="kn">from</span> <span class="nn">labml_nn.optimizers.configs</span> <span class="kn">import</span> <span class="n">OptimizerConfigs</span></pre></div>
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|         </div>
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|     </div>
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|     <div class='section' id='section-1'>
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|         <div class='docs doc-strings'>
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|             <div class='section-link'>
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|                 <a href='#section-1'>#</a>
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|             </div>
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|             <p><a id="MNISTConfigs"></a></p>
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| <h2>训练器配置</h2>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">24</span><span class="k">class</span> <span class="nc">MNISTConfigs</span><span class="p">(</span><span class="n">MNISTDatasetConfigs</span><span class="p">,</span> <span class="n">TrainValidConfigs</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-2'>
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|         <div class='docs'>
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|             <div class='section-link'>
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|                 <a href='#section-2'>#</a>
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|             </div>
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|             <p>优化器</p>
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| 
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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="n">optimizer</span><span class="p">:</span> <span class="n">torch</span><span class="o">.</span><span class="n">optim</span><span class="o">.</span><span class="n">Adam</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>训练设备</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">34</span>    <span class="n">device</span><span class="p">:</span> <span class="n">torch</span><span class="o">.</span><span class="n">device</span> <span class="o">=</span> <span class="n">DeviceConfigs</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>分类模型</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">37</span>    <span class="n">model</span><span class="p">:</span> <span class="n">Module</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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|             <p>要训练的时代数</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">39</span>    <span class="n">epochs</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</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>一个纪元内在训练和验证之间切换的次数</p>
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| 
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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="n">inner_iterations</span> <span class="o">=</span> <span class="mi">10</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>精度函数</p>
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| 
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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">accuracy</span> <span class="o">=</span> <span class="n">Accuracy</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>亏损函数</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">47</span>    <span class="n">loss_func</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">CrossEntropyLoss</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 doc-strings'>
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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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|             <h3>初始化</h3>
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| 
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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="k">def</span> <span class="nf">init</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-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>设置跟踪器配置</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">54</span>        <span class="n">tracker</span><span class="o">.</span><span class="n">set_scalar</span><span class="p">(</span><span class="s2">"loss.*"</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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| <span class="lineno">55</span>        <span class="n">tracker</span><span class="o">.</span><span class="n">set_scalar</span><span class="p">(</span><span class="s2">"accuracy.*"</span><span class="p">,</span> <span class="kc">True</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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|             <p>向日志模块输出添加钩子</p>
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| 
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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="n">hook_model_outputs</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">,</span> <span class="s1">'model'</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>增加作为状态模块的精度。这个名字可能令人困惑,因为它旨在存储 RNN 的训练和验证之间的状态。这将使精度指标统计数据分开,以便进行训练和验证。</p>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">62</span>        <span class="bp">self</span><span class="o">.</span><span class="n">state_modules</span> <span class="o">=</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">accuracy</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 doc-strings'>
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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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|             <h3>培训或验证步骤</h3>
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| 
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|         </div>
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|         <div class='code'>
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|             <div class="highlight"><pre><span class="lineno">64</span>    <span class="k">def</span> <span class="nf">step</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">batch</span><span class="p">:</span> <span class="nb">any</span><span class="p">,</span> <span class="n">batch_idx</span><span class="p">:</span> <span class="n">BatchIndex</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-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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|             <p>训练/评估模式</p>
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| 
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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="bp">self</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">train</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="o">.</span><span class="n">is_train</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-15'>
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|         <div class='docs'>
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|             <div class='section-link'>
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|                 <a href='#section-15'>#</a>
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|             </div>
 | |
|             <p>将数据移动到设备</p>
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| 
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|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">73</span>        <span class="n">data</span><span class="p">,</span> <span class="n">target</span> <span class="o">=</span> <span class="n">batch</span><span class="p">[</span><span class="mi">0</span><span class="p">]</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> <span class="n">batch</span><span class="p">[</span><span class="mi">1</span><span class="p">]</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-16'>
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|         <div class='docs'>
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|             <div class='section-link'>
 | |
|                 <a href='#section-16'>#</a>
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|             </div>
 | |
|             <p>在训练模式下更新全局步长(处理的样本数)</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">76</span>        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="o">.</span><span class="n">is_train</span><span class="p">:</span>
 | |
| <span class="lineno">77</span>            <span class="n">tracker</span><span class="o">.</span><span class="n">add_global_step</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">data</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-17'>
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|         <div class='docs'>
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|             <div class='section-link'>
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|                 <a href='#section-17'>#</a>
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|             </div>
 | |
|             <p>是否捕获模型输出</p>
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| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">80</span>        <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">is_log_activations</span><span class="o">=</span><span class="n">batch_idx</span><span class="o">.</span><span class="n">is_last</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-18'>
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|         <div class='docs'>
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|             <div class='section-link'>
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|                 <a href='#section-18'>#</a>
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|             </div>
 | |
|             <p>获取模型输出。</p>
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| 
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|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">82</span>            <span class="n">output</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">(</span><span class="n">data</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-19'>
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|         <div class='docs'>
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|             <div class='section-link'>
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|                 <a href='#section-19'>#</a>
 | |
|             </div>
 | |
|             <p>计算并记录损失</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">85</span>        <span class="n">loss</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">loss_func</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="n">target</span><span class="p">)</span>
 | |
| <span class="lineno">86</span>        <span class="n">tracker</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="s2">"loss."</span><span class="p">,</span> <span class="n">loss</span><span class="p">)</span></pre></div>
 | |
|         </div>
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|     </div>
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|     <div class='section' id='section-20'>
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|         <div class='docs'>
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|             <div class='section-link'>
 | |
|                 <a href='#section-20'>#</a>
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|             </div>
 | |
|             <p>计算和记录精度</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">89</span>        <span class="bp">self</span><span class="o">.</span><span class="n">accuracy</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="n">target</span><span class="p">)</span>
 | |
| <span class="lineno">90</span>        <span class="bp">self</span><span class="o">.</span><span class="n">accuracy</span><span class="o">.</span><span class="n">track</span><span class="p">()</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-21'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-21'>#</a>
 | |
|             </div>
 | |
|             <p>训练模型</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">93</span>        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="o">.</span><span class="n">is_train</span><span class="p">:</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-22'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-22'>#</a>
 | |
|             </div>
 | |
|             <p>计算梯度</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">95</span>            <span class="n">loss</span><span class="o">.</span><span class="n">backward</span><span class="p">()</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-23'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-23'>#</a>
 | |
|             </div>
 | |
|             <p>采取优化器步骤</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">97</span>            <span class="bp">self</span><span class="o">.</span><span class="n">optimizer</span><span class="o">.</span><span class="n">step</span><span class="p">()</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-24'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-24'>#</a>
 | |
|             </div>
 | |
|             <p>记录每个纪元最后一批的模型参数和梯度</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">99</span>            <span class="k">if</span> <span class="n">batch_idx</span><span class="o">.</span><span class="n">is_last</span><span class="p">:</span>
 | |
| <span class="lineno">100</span>                <span class="n">tracker</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="s1">'model'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">)</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-25'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-25'>#</a>
 | |
|             </div>
 | |
|             <p>清除渐变</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">102</span>            <span class="bp">self</span><span class="o">.</span><span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-26'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-26'>#</a>
 | |
|             </div>
 | |
|             <p>保存跟踪的指标</p>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">105</span>        <span class="n">tracker</span><span class="o">.</span><span class="n">save</span><span class="p">()</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-27'>
 | |
|         <div class='docs doc-strings'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-27'>#</a>
 | |
|             </div>
 | |
|             <h3>默认优化器配置</h3>
 | |
| 
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">108</span><span class="nd">@option</span><span class="p">(</span><span class="n">MNISTConfigs</span><span class="o">.</span><span class="n">optimizer</span><span class="p">)</span>
 | |
| <span class="lineno">109</span><span class="k">def</span> <span class="nf">_optimizer</span><span class="p">(</span><span class="n">c</span><span class="p">:</span> <span class="n">MNISTConfigs</span><span class="p">):</span></pre></div>
 | |
|         </div>
 | |
|     </div>
 | |
|     <div class='section' id='section-28'>
 | |
|         <div class='docs'>
 | |
|             <div class='section-link'>
 | |
|                 <a href='#section-28'>#</a>
 | |
|             </div>
 | |
|             
 | |
|         </div>
 | |
|         <div class='code'>
 | |
|             <div class="highlight"><pre><span class="lineno">113</span>    <span class="n">opt_conf</span> <span class="o">=</span> <span class="n">OptimizerConfigs</span><span class="p">()</span>
 | |
| <span class="lineno">114</span>    <span class="n">opt_conf</span><span class="o">.</span><span class="n">parameters</span> <span class="o">=</span> <span class="n">c</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">parameters</span><span class="p">()</span>
 | |
| <span class="lineno">115</span>    <span class="n">opt_conf</span><span class="o">.</span><span class="n">optimizer</span> <span class="o">=</span> <span class="s1">'Adam'</span>
 | |
| <span class="lineno">116</span>    <span class="k">return</span> <span class="n">opt_conf</span></pre></div>
 | |
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