on there, it is used to parallelize computations, but the cluster is not stopped within the function. If there is not a cluster in <code>model</code>, then the function falls back to the argument <code>n.cores</code> to generate a cluster that is stopped when the function ends its operations.</p>
<p>These changes should improve performance when working with several functions in the same script, becuase these functions do not have to waste time in generating their own clusters.</p>
<p>The function <code>rf_i