span class="op">(</span><span class="op">)</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">)</span>&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t29" href="#t29">29</a></span><span class="t">        <span class="key">return</span> <span class="nam">loss</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t30" href="#t30">30</a></span><span class="t">&nbsp;</span><span class="r"></span