The log-likelihoods attained by the greedy (black), MCMC (blue), and
CAST (red) methods are plotted against CPU run time, for the second, larger
dataset. All times and likelihoods smaller than those obtained from the lazy
greedy algorithm (green dot) are not shown; in particular, the first 1083
seconds of the greedy algorithm, during which the greedy configuration had a
smaller likelihood than the lazy greedy configuration, are not shown. All the
MCMC and CAST runs were initialized with the lazy greedy configuration: each run
starts at the same green dot. The thick dotted red line indicates the best
likelihood eventually obtained from the best of 30 CAST runs, after 36
hours.