      <span class="nam">loss</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">loss_fn</span><span class="op">(</span><span class="nam">pred</span><span class="op">,</span> <span class="nam">gt</span><span class="op">)</span>&nbsp;</span><span class="r"></span></p>
    <p class="mis show_mis"><span class="n"><a id="t66" href="#t66">66</a></span><span class="t">        <span class="key">return</span> <span class="nam">loss</span>&nbsp;</span><span class=