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<h1>Utilities for Transformer</h1>
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<div class="highlight"><pre><span class="lineno">10</span><span></span><span class="kn">import</span> <span class="nn">torch</span></pre></div>
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<h2>Subsequent mask to mask out data from future (subsequent) time steps</h2>
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<div class="highlight"><pre><span class="lineno">13</span><span class="k">def</span> <span class="nf">subsequent_mask</span><span class="p">(</span><span class="n">seq_len</span><span class="p">):</span></pre></div>
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<div class="highlight"><pre><span class="lineno">17</span> <span class="n">mask</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">tril</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="n">seq_len</span><span class="p">,</span> <span class="n">seq_len</span><span class="p">))</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">bool</span><span class="p">)</span><span class="o">.</span><span class="n">unsqueeze</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
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<span class="lineno">18</span> <span class="k">return</span> <span class="n">mask</span></pre></div>
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<div class="highlight"><pre><span class="lineno">21</span><span class="k">def</span> <span class="nf">_subsequent_mask</span><span class="p">():</span>
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<span class="lineno">22</span> <span class="kn">from</span> <span class="nn">labml.logger</span> <span class="kn">import</span> <span class="n">inspect</span>
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<span class="lineno">23</span> <span class="n">inspect</span><span class="p">(</span><span class="n">subsequent_mask</span><span class="p">(</span><span class="mi">10</span><span class="p">)[:,</span> <span class="p">:,</span> <span class="mi">0</span><span class="p">])</span>
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<span class="lineno">24</span>
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<span class="lineno">25</span>
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<span class="lineno">26</span><span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
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<span class="lineno">27</span> <span class="n">_subsequent_mask</span><span class="p">()</span></pre></div>
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