ass="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">config</span><span class="o">.</span><span class="n">data_dir</span><span class="p">,</span> <span class="n">config</span><span class="o">.</span><span class="n">urls</span><span class="p">[</span><span class="s2">&quot;class_size&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">filename</span><span class="p">)</span>
<span class="n">__ptr_file</span> <span class="o">=</sp