/span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t6" href="#t6">6</a></span><span class="t"><span class="key">class</span> <span class="nam">AbsLoss</span><span class="op">(</span><span class="nam">object</span><span class="op">)</span><span class="op">:</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t7" href="#t7">7</a></span><span class="t">    <span class="str">r"""An abstract class for loss functions. </span>&nbsp;</span><span class="r