lass="n"><a id="t19" href="#t19">19</a></span><span class="t">&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t20" href="#t20">20</a></span><span class="t"><span class="str">        Return:</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t21" href="#t21">21</a></span><span class="t"><span class="str">            torch.Tensor: The loss.</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t22" href