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| #pragma section-numbers 2 | |
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| * [[#heuristic|heuristics]] * [[#g|g-evaluator]] * [[#pref|preference evaluator]] * [[#sum|sum evaluator]] * [[#weight|weight evaluator]] |
<<TableOfContents>> |
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| === Heuristic === | == Heuristics == |
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| Every [[HeuristicOverview|heuristic]] is a ScalarEvaluator. | Every HeuristicSpecification defines a ScalarEvaluator. |
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| === g-value evaluator === | == g-value evaluator == |
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| === Preference evaluator === | == Preference evaluator == |
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| === Sum evaluator === | == Sum evaluator == |
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| sum(evaluator1, evaluator2, ...) | sum(evals) |
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| * `evaluator1, evaluator2, ...` (comma-separated list of [[ScalarEvaluator]]s): at least one scalar evaluator | * `evals` (list of [[ScalarEvaluator]]s): at least one scalar evaluator |
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| === Weighted evaluator === | == Weighted evaluator == |
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Scalar evaluators
XXX TODO: description of the role of scalar evaluators
1. Heuristics
Every HeuristicSpecification defines a ScalarEvaluator.
2. g-value evaluator
g()
Returns the current g-value of the search.
3. Preference evaluator
pref()
Returns 0 if preferred is true and 1 otherwise.
4. Sum evaluator
sum(evals)
Calculates the sum of the sub-evaluators.
evals (list of ScalarEvaluators): at least one scalar evaluator
5. Weighted evaluator
weight(scalar_evaluator, weight)
Multiplies the value of the scalar evaluator with the given weight.
scalar_evaluator (ScalarEvaluator): scalar evaluator
weight (int): weight