Constraint-Based Reasoning by Eugene C. Freuder, Alan K. Mackworth

By Eugene C. Freuder, Alan K. Mackworth

Constraint-based reasoning is a crucial region of automatic reasoning in synthetic intelligence, with many purposes. those comprise configuration and layout difficulties, making plans and scheduling, temporal and spatial reasoning, defeasible and causal reasoning, computing device imaginative and prescient and language knowing, qualitative and diagnostic reasoning, and specialist platforms. Constraint-Based Reasoning provides present paintings within the box at a number of degrees: conception, algorithms, languages, functions, and hardware.Constraint-based reasoning has connections to a wide selection of fields, together with formal common sense, graph concept, relational databases, combinatorial algorithms, operations study, neural networks, fact upkeep, and good judgment programming. the perfect of describing an issue area in average, declarative phrases after which letting normal deductive mechanisms synthesize person ideas has to some degree been learned, or even embodied, in programming languages.Contents :- creation, E. C. Freuder, A. ok. Mackworth.- The good judgment of Constraint delight, A. ok. Mackworth.- Partial Constraint delight, E. C. Freuder, R. J. Wallace.- Constraint Reasoning according to period mathematics: The Tolerance Propagation procedure, E. Hyvonen.- Constraint delight utilizing Constraint good judgment Programming, P. Van Hentenryck, H. Simonis, M. Dincbas.- Minimizing Conflicts: A Heuristic fix process for Constraint pride and Scheduling difficulties, S. Minton, M. D. Johnston, A. B. Philips, and P. Laird.- Arc Consistency: Parallelism and area Dependence, P. R. Cooper, M. J. Swain.- constitution identity in Relational info, R. Dechter, J. Pearl.- studying to enhance Constraint-Based Scheduling, M. Zweben, E. Davis, B. Daun, E. Drascher, M. Deale, M. Eskey.- Reasoning approximately Qualitative Temporal details, P. van Beek.- a geometrical Constraint Engine, G. A. Kramer.- A thought of clash answer in making plans, Q. Yang.A Bradford ebook.

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Essentially all n - i edges in the tree have to be processed once, with each processing requiring at most d consistency checks. E lt should be emphasized that these results, indeed more powerful results, have already been obtained in a closely related context [TI. The context is a CSP with multiple solutions, where the objective is to choose a solution which maximizes the value of a criterion function. C. ]. Wallace single solution, one could presumably use the criterion function to simulate a maximal satisfaction problem.

This might involve retaining information about the conditions of failure, employing conditional counts that can only be used if the supporting values are not used in the solution. In the arc consistency count algorithm, in contrast, which takes one pass through the variables, we are assured that the consistency counts are all unconditional. 2. Forward checking Forward checking is a hybrid algorithm that uses a very limited amount of arc consistency checking. Each time a value, u, is assigned to a variable, V, the algorithm looks ahead to all the variables that currently have not been assigned a value, and that share a constraint with V, and removes from the domains of these variables any values inconsistent with u.

Each comparison of two values is a constraint check. Since the total number of constraint checks is a standard measure of CSP algorithm efficiency, we wish to minimize this quantity. To this end, the new distance is compared with N after each constraint failure, so that if the bound is reached, the present value is not checked further, A subtle point involves the test to see if Distance is already N before trying a new value, u, for V. ) One might wonder, if the number of inconsistencies among the already chosen values stored in Search-path equals the bound, what is the algorithm doing trying to extend Search-path to another variable, V?

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