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BoltzmannSelector produces [NaN] probability array #39

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jenetics opened this issue Jun 25, 2015 · 1 comment
Closed

BoltzmannSelector produces [NaN] probability array #39

jenetics opened this issue Jun 25, 2015 · 1 comment
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bug
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v3.2.0

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For some configuration values and fitness values the BoltzmannSelector.probabilities returns a [NaN] array.
@jenetics jenetics added the bug label Jun 25, 2015
@jenetics jenetics self-assigned this Jun 25, 2015
@jenetics jenetics added this to the v3.2.0 milestone Jun 25, 2015
@jenetics jenetics changed the title BoltzmanaSelector produces [Nan] probability array BoltzmannSelector produces [NaN] probability array Jun 25, 2015
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The specific error occurs if all the fitness values are zero. The general problem is if the maximal fitness value is zero. In this case the BoltzmannSelector will perform a division by zero.

jenetics added a commit that referenced this issue Jun 25, 2015
@jenetics
#39: Add some tests for reproducing error.
903fe2c
jenetics added a commit that referenced this issue Jun 25, 2015
@jenetics
#39: Add a 'checkAndCorrect' helper method.
fe51225 
This method will check if all probabilites are finite. If not, all probability values will be set to the same value.
jenetics added a commit that referenced this issue Jul 8, 2015
@jenetics
#39: Numerically stabilize the 'BoltzmannSelector'
843b56c
jenetics added a commit that referenced this issue Jul 8, 2015
@jenetics
#39: Streamlining 'ProbabilitySelector' classes.
dbaa013 
Unify pre- and post-condition checks.
jenetics added a commit that referenced this issue Jul 8, 2015
@jenetics
#39: Remove unnecessary post-condition check.
4644e8a
@jenetics jenetics closed this as completed Jul 8, 2015
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