n class="n">src</span><span class="p">):</span>
<span class="lineno">47</span>            <span class="bp">self</span><span class="o">.</span><span class="n">src_mask</span> <span class="o">=</span> <span class="n">subsequent_mask</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">src</span><span class="p">))</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">src</span><span class="o">.</span><span class="n">device</sp