eady in the CVX atom library. Good
choices include <tt class="docutils literal"><span class="pre">huber</span></tt>, <tt class="docutils literal"><span class="pre">inv_pos</span></tt>, <tt class="docutils literal"><span class="pre">lambda_min</span></tt>, <tt class="docutils literal"><span class="pre">lambda_max</span></tt>,
<tt class="docutils literal"><span class="pre">matrix_frac</span></tt>, <tt class="docutils literal"><span class="pre">quad_over_lin</span></tt>, <tt class="docutils literal"><span clas