Implementing Backtrack in Production System: A TMS based Approach .
Keywords: Production System languages, Dependency directed backtracking, Rete Net operations .
AbstractOPS5 is one of the most widely used Production System languages. The control strategies provided in OPS-like languages are extremely weak and consequently during problem solving, frequently dead-ends are encountered. We have made an attempt to perform dependency-directed backtracking within the framework of an OPS-like interpreter which employs a Truth Maintenance System for reasoning with past actions. The conditions for backtrack are characterised by the violation of a set of domain-specific constraints and signaled as contradictions in the Dependency Network (D-Net). We have developed a system, called OPS91, which comprises an enhanced match-select-act cycle operating on a D-Net as working memory. This cycle is explained with reference to the D-Net structure and the correlation between the D-Net and Rete-Net operations. The revision algorithm and null conflict set resolution strategy are detailed. The performance of the system is evaluated and broad guidelines on the programming strategy are presented.
How to Cite
Jaidev, M., Prakash, G., & Parameswaran, N. (2013). Implementing Backtrack in Production System: A TMS based Approach . Defence Science Journal, 43(2), 151-158. https://doi.org/10.14429/dsj.43.4325
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