<s><span class="pre">'eval'</span></s><span class="p"><span class="pre">,</span></span><span class="w"> </span><s><span class="pre">'train'</span></s><span class="p"><span class="pre">]</span></span></span></em>, <em class="sig-param"><span class="n"><span class="pre">else_</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Optional</span><span class="p"><span class="pre">[</span></span><a class="reference internal" href="padl.transforms.h