nal</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">nuisance_prior</span><span class="o">.</span><span class="n">sample</span><span class="p">(</span><span class="n">sample_shape</span><span class="o">=</span><span class="p">(</span><span class="n">Y</span><span class="p">[</span><span class="n">Y</span> <span class="o">==</span> <span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">shape</span><span class="p">[</span><sp