Lessons Learned from the CYK Algorithm for Parsing-based Verification of Hierarchical Plans
Verification of hierarchical plans deals with the problem of whether an action sequence is causally consistent and can be obtained by a decomposition of a goal task. This second sub-problem (finding the decomposition) makes the verification problem NP-hard. The task decomposition structure is very c...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
LibraryPress@UF
2023-05-01
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| Series: | Proceedings of the International Florida Artificial Intelligence Research Society Conference |
| Subjects: | |
| Online Access: | https://journals.flvc.org/FLAIRS/article/view/133196 |
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| Summary: | Verification of hierarchical plans deals with the problem of whether an action sequence is causally consistent and can be obtained by a decomposition of a goal task. This second sub-problem (finding the decomposition) makes the verification problem NP-hard. The task decomposition structure is very close to a parsing tree of context-free grammar (CFG). Recently, the CFG-parsing algorithm by Cocke–Younger–Kasami (CYK) has been modified to verify hierarchical plans efficiently. Despite being fast, the algorithm can only handle totally-ordered planning domains. In this paper, we ask whether the ideas from the CYK algorithm can be extended to a more general parsing-based approach that covers all planning domains, i.e., including partially ordered ones. More specifically, we study the effect of modifying the domain model by limiting the number of sub-tasks in decomposition methods to two and the effect of changing the parsing strategy. |
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| ISSN: | 2334-0754 2334-0762 |