point_dim:</span>
<span class="sd">            The dimension of the points the inputs consist of.</span>

<span class="sd">    Returns:</span>
<span class="sd">        A four-tuple consisting of (1) the constructed ``batch``, i.e., a</span>
<span class="sd">        tensor with size</span>
<span class="sd">        ``batch_size`` x ``n_max_points`` x ``point_dim``; (2) a tensor</span>
<span class="sd">        ``not_dummy`` of size ``batch_size`` x ``n_max_points``, where</span>
<span class="sd">        ``1`` 