ges of shape
        <code class="docutils literal notranslate">
         <span class="pre">
          (3
         </span>
         <span class="pre">
          x
         </span>
         <span class="pre">
          H
         </span>
         <span class="pre">
          x
         </span>
         <span class="pre">
          W)
         </span>
        </code>
        , where
        <code class="docutils literal notranslate">
         <span class="pre">
          H
         </span>
        </code>
   