span class="sd">        activation (str or function, optional): activation function</span>
<span class="sd">        concat_hidden (bool, optional): concat hidden representations from all layers as output</span>
<span class="sd">        readout (str, optional): readout function. Available functions are ``sum`` and ``mean``.</span>
<span class="sd">    """</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span c