 obtained by obtaining
estimators \(f_n\) and \(f_{n,s}\) of \(f_0\) and \(f_{0,s}\),
respectively; obtaining an estimator \(P_n\) of \(P_0\); and finally,
setting \(\psi_{n,s} := V(f_n, P_n) - V(f_{n,s}, P_n)\).</p>
<p>In the interest of transparency, we return most of the calculations
within the <code>vim</code> object. This results in a list including:</p><dl><dt>s</dt>
<dd><p>the column(s) to calculate variable importance for</p></dd>

 <dt>SL.library</dt>
<dd><p>the library of learners passed to <code>