parameters" class="anchor-heading" aria-labelledby="optional-parameters"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Optional Parameters </h3> <div class="table-wrapper"><table> <tbody> <tr> <td>discrete</td> <td>list</td> <td>[ ]</td> <td>The list of columns that have been dummified (discrete).</td> </tr> <tr> <td>C</td> <td>integer</td> <td>1</td> <td>The regularization constant used in the objective method with the matrix.</td> </tr> <tr> <td>k_tr</td> <td>int