Author: Atsuyoshi Nakamura
Source: Theoretical Computer Science Vol. 241, No. 1-2, 2000, 83-114.
Abstract. In this paper, we study exact learnability of bounded-width ordered binary decision diagrams (OBDDs) when no ordering of the variables is given and learning is conducted by way of equivalence queries and membership queries. We present a learning algorithm for width-2 OBDDs, an algorithm which uses O(n3) equivalence queries alone, where n is the number of variables. We also present a learning algorithm for width-2 OBDDs that uses O(n) proper equivalence queries and O(n2) membership queries. Further, we show a negative result: that there are no polynomial-time algorithms capable of learning width-3 OBDDs from proper equivalence queries alone.
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