">z1</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">z</span><span class="p">,</span> <span class="p">[</span><span class="n">h</span><span class="o">-</span><span class="mi">1</span><span class="p">])[</span><span class="mi">0</span><span class="p">],</span> <span class="n">np</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">z</span><span class="p">,</span> <