ile</code> which includes calculation with and without automatic
differentiation</li>
<li><code>forward_time</code>, The time spent in the <code>profile</code> statement during the
forward pass of a reverse mode automatic differentiation calculation or during
a cauculation without automatic differentiation</li>
<li><code>reverse_time</code>, The time spent in the <code>profile</code> statement during the reverse
(backward) pass of reverse mode automatic differentiation</li>
<li><code>chain_stack</code>, The