Right now, the LM count heuristic is the only one where the user needs to
specify whether prefererred operators should be computed. (In addition to
specifying the pref. ops. heuristics during search.) This is because computing
preferred operators is comparatively expensive here. (Except if we're using the
FF/LM synergy, which does a relaxed exploration anyway -- in that case, pref.
ops. are always computed.)
It would be nice if the heuristic were told by the search algorithm whether or
not preferred operators will be requested so that this manual specification
becomes unnecessary.
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