
<span class="sd">        &gt;&gt;&gt; batch, not_dummy, max_pts, batch_size = prepare_batch(x)</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">if</span> <span class="n">point_dim</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">point_dim</span> <span class="o">=</span> <span class="n">batch</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">size</span><