GOLEM
As FOIL, GOLEM is a “classic” among empirical ILP systems. It has been applied successfully on real-world problems such as protein structure prediction and finite element mesh design. GOLEM copes efficiently with large datasets. It achieves this efficiency because it avoids searching a large hypothesis space for consistent hypotheses as, for instance, FOIL, but rather constructs a unique clause covering a set of positive examples relative to the available background knowledge. The principle is based on the relative least general generalisations (rlggs) introduced by Plotkin. GOLEM embeds the construction of rlggs in a covering approach. For the induction of a single clause, it randomly selects several pairs of positive examples and computes their rlggs. Among these rlggs, GOLEM chooses the one which covers the largest number of positive examples and is consistent with the negative examples. This clause is then further generalised. GOLEM randomly selects a set of positive examples and constructs the rlggs of each of these examples and the clause obtained in the first construction step. Again, the rlgg with the greatest coverage is selected and generalised by the same process. The generalisation process is repeated until the coverage of the best clause stops increasing. GOLEM conducts a postprocessing step, which reduces induced clauses by removing irrelevant literals. ..
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References in zbMATH (referenced in 50 articles )
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