to compose higher level modules.
        <code class="docutils literal notranslate">
         <span class="pre">
          Modules
         </span>
        </code>
        contain a constructor to set up the modules, parameters and sub-modules
and a forward function which describes how to use the parameters and submodules when the module is invoked.
       </p>
       <p>
        For example, we can define a LeNet module like this:
       </p>
       <div class="highlight-python notranslate">
        <table