Journal
JOURNAL OF EXPERIMENTAL & THEORETICAL ARTIFICIAL INTELLIGENCE
Volume 21, Issue 4, Pages 233-257Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09528130802667690
Keywords
constraint hierarchies; soft constraints; local consistency
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Funding
- Hong Kong Special Administrative Region [CUHK4358/02E]
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We provide a reformulation of the constraint hierarchies (CHs) framework based on the notion of error indicators. Adapting the generalised view of local consistency in semiring-based constraint satisfaction problems, we define constraint hierarchy k-consistency (CH-k-C) and give a CH-2-C enforcement algorithm. We demonstrate how the CH-2-C algorithm can be seamlessly integrated into the ordinary branch-and-bound algorithm to make it a finite domain (FD) CH solver. Experimentation confirms the efficiency and robustness of our proposed solver prototype. Unlike other FD CH solvers, our proposed method works for both local and global comparators. In addition, our solver can support arbitrary error functions.
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