</span><span class="mi">2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">len_variables</span><span class="p">))</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">lower_bound</span> <span class="o">=</span> <span class="n">lower_bound</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">alpha</span> <span class="o">=</span> <span class="n">alpha</span>

        <span class="bp">self</span><span