The University of Edinburgh -
Division of Informatics
Forrest Hill & 80 South Bridge

PhD Thesis #8915

Title:An Investigation of Design and Execution Alternatives for the Committed Choice Non-Deterministic Logic Languages
Date: 1989
Abstract:The general area of developing applying and studying new and parallel models of computation is motivated by a need to overcome the limits of current Von Neumann based architectures. A key area of research in understanding how new technology can be applied to AI problem solving is through using logic languages. Logic programming language provide a procedural interpretation for sentences of first order logic, mainly using a class of sentence called Horn clauses. Horn clauses are open to a wide variety of parallel evaluation models, giving possible speed-ups and alternative parallel models of execution. The research in this thesis is concerned with investigating one class of parallel logic language known as Committed Choice Non-Deterministic languages. The investigation considers the inherent parallel behaviour of AI programs implemented in the CCND languages and the effect of various alternatives open to language implementors and designers. This is achieved by considering how various AI programming techniques map to alternative language designs and the behaviour of these AI programs on alternative implementations of these languages. The aim of this work is to investigate how AI programming techniques are affected (qualitatively and quantitatively) by particular language features. the qualitative evaluation is a consideration of how AI programs can be mapped to the various CCND languages. The applications considered are general search algorithms (which focuses on the committed choice nature of the languages); chart parsing (which focuses on the committed choice nature of the languages); chart parsing (which focuses on the difference between deep and flat languages). The quantitative evaluation considers the inherent parallel behaviour of the resulting programs and the effect of possible implementation alternatives on this inherent behaviour. To carry out this quantitative evaluation we have implemented a system which improves on the current interp

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