Learning Bayesian Networks: Search Methods and Experimental Results
Learning Bayesian Networks: Search Methods and Experimental Results
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发表时间:
1995
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通讯作者:
M. Chickering;D. Geiger;D. Heckerman
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作者:
M. Chickering;D. Geiger;D. Heckerman
We discuss Bayesian approaches for learning Bayesian networks from data. First, we review a metric for computing the relative posterior probability of a network structure given data developed by Heckerman et al. (1994a,b,c). We see that the metric has a property useful for inferring causation from data. Next, we describe search methods for identifying network structures with high posterior probabilities. We describe polynomial algorithms for (cid:12)nding the highest-scoring network structures in the special case where every node has at most k = 1 parent. We show that the general case (k > 1) is NP-hard, and review heuristic search algorithms for this general case. Finally, we describe a methodology for evaluating learning algorithms, and use this methodology to evaluate various scoring metrics and search procedures.