modify NoveltyEvaluator, add EntropyEvaluator to Measure - Githubissues

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modify NoveltyEvaluator, add EntropyEvaluator to Measure #206

Closed SunYatong closed 6 years ago

SunYatong commented 6 years ago

calculate "itemCounts" in a more efficient way for NoveltyEvaluator.
add EntropyEvaluator to Measure.
format the code.