"><span class="r-pr">#&gt;</span>   solver:          Gurobi [first_feasible (0), gap (0), number_solutions (1), presolve (2), solution_pool_method (2), threads (1), time_limit (2147483647), time_limit (2147483647), verbose (1)]</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># print number of features</span></span></span>
<span class="r-in"><span><span class="fu">number_of_features</span><span class="op">(</span><span class="va">p</span><span class="op">)</span></spa