pan><span class="o">.</span><span class="n">METADATA</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;version&#39;</span><span class="p">)</span>
            <span class="n">CounterfactualExplanations</span><span class="o">.</span><span class="n">_validate_serialization_version</span><span class="p">(</span><span class="n">version</span><span class="p">)</span>

            <span class="k">if</span> <span class="n">version</span> <