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Local consistency information


In constraint satisfaction, local consistency conditions are properties of constraint satisfaction problems related to the consistency of subsets of variables or constraints. They can be used to reduce the search space and make the problem easier to solve. Various kinds of local consistency conditions are leveraged, including node consistency, arc consistency, and path consistency.

Every local consistency condition can be enforced by a transformation that changes the problem without changing its solutions; such a transformation is called constraint propagation. Constraint propagation works by reducing domains of variables, strengthening constraints, or creating new constraints. This leads to a reduction of the search space, making the problem easier to solve by some algorithms. Constraint propagation can also be used as an unsatisfiability checker, incomplete in general but complete in some particular cases.

Local consistency conditions can be grouped into various classes. The original local consistency conditions require that every consistent partial assignment (of a particular kind) can be consistently extended to another variable. Directional consistency only requires this condition to be satisfied when the other variable is greater than the ones in the assignment, according to a given order. Relational consistency includes extensions to more than one variable, but this extension is only required to satisfy a given constraint or set of constraints.

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Local consistency

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kinds of local consistency conditions are leveraged, including node consistency, arc consistency, and path consistency. Every local consistency condition...

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Consistency model

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In computer science, a consistency model specifies a contract between the programmer and a system, wherein the system guarantees that if the programmer...

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Release consistency

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Release consistency is one of the synchronization-based consistency models used in concurrent programming (e.g. in distributed shared memory, distributed...

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Constraint programming

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kinds of local consistency conditions are leveraged, including node consistency, arc consistency, and path consistency. Every local consistency condition...

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Constraint satisfaction problem

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The most known and used forms of local consistency are arc consistency, hyper-arc consistency, and path consistency. The most popular constraint propagation...

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Forward chaining

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Backward chaining

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Inference engine

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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Knowledge engineering

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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Cognitive dissonance

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Festinger proposed that human beings strive for internal psychological consistency to function mentally in the real world. A person who experiences internal...

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Complexity of constraint satisfaction

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forms of local consistency, this algorithm may also require exponential time. However, for some problems and for some kinds of local consistency, it is...

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Processor consistency

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Processor Consistency is one of the consistency models used in the domain of concurrent computing (e.g. in distributed shared memory, distributed transactions...

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CycL

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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CLIPS

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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State space planning

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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Expert system

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Of Artificial Intelligence. MIT Press. pp. 185–250. Bezem M (1988). Consistency of rule-based expert systems. 9th International Conference on Automated...

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Distributed artificial intelligence

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where the resource management entity ensures local optimization and cooperation for global and local consistency Multi-Agent systems, e.g. artificial life...

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Automated reasoning

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is that of argumentation, where further constraints of minimality and consistency are applied on top of the more standard automated deduction. John Pollock's...

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Cache coherence

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definition of a coherent system is via the definition of sequential consistency memory model: "the cache coherent system must appear to execute all threads’...

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Attempto Controlled English

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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Local search engine optimisation

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as a low number of duplicates, consistency and also a fair number of citations, mattered for a business to show in Local Packs. However, within the pack...

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Natural deduction

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and require no appeals to models. The first of these is local consistency, also known as local reducibility, which says that any derivation containing...

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Time zone

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Cleveland Abbe divided the United States into four standard time zones for consistency among the weather stations. In 1879, he published a paper titled Report...

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Commonsense reasoning

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satisfaction Constraint programming Constraint logic programming Local consistency SMT solvers Automated planning Motion planning Multi-agent planning...

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