Cost Based Satisficing Search Considered Harmful

Details Cost Based Satisficing Search Considered Harmful Cost Based Satisficing Search Considered Harmful

2011-03-18

arxiv.org/abs/1103.3687v1

Computer Science

Artificial Intelligence

Longer version of an extended abstract from SOCS 2010

Scientific paper

Recently, several researchers have found that cost-based satisficing search with A* often runs into problems. Although some "work arounds" have been proposed to ameliorate the problem, there has not been any concerted effort to pinpoint its origin. In this paper, we argue that the origins can be traced back to the wide variance in action costs that is observed in most planning domains. We show that such cost variance misleads A* search, and that this is no trifling detail or accidental phenomenon, but a systemic weakness of the very concept of "cost-based evaluation functions + systematic search + combinatorial graphs". We show that satisficing search with sized-based evaluation functions is largely immune to this problem.

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