concepts.dm.crow.csp_solver.dpll_sampling.dpll_filter_unused_rhs#

dpll_filter_unused_rhs(executor, constraints, assignments, index2record)[source]#

Filter out constraints that only appear once in the RHS of the constraints. In this case, the variable can be ignored and the related constraints can be removed.

Parameters:

executor (CrowExecutor) – the executor.
constraints (List[Constraint | GroupConstraint | None]) – the list of constraints.
assignments (Dict[int, Assignment]) – the dictionary of assignments.
index2record (Dict[int, OptimisticValueRecord]) – the dictionary of variable records.

Returns:

the list of constraints that have not been satisfied, after removing all unused variables.

Return type:

List[Constraint | GroupConstraint | None]