Module `S.WeightFun`

Weight functions

type t = C.t -> int: attribute a weight to a clause. The smaller, the better (lightweight clauses will be favored). A weight must always be positive; the weight of the empty clause should alwyays be 0.

val default : t: Use Literal.heuristic_weight

val penalty : t: Returns the penalty of the clause

val favor_all_neg : t: Favor clauses with only negative ground lits

val favor_non_all_neg : t: Favor clauses that have at least one non-(ground negative) lit

val favor_ground : t
val favor_horn : t
val favor_goal : t: The closest a clause is from the initial goal, the lowest its weight. Some threshold is used for clauses that are too far away

val combine : (t * int) list -> t: Combine a list of pairs w, coeff where w is a weight function, and coeff a strictly positive number. This is a weighted sum of weights.