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 * [cosine similarity for vector space models](http://pyevolve.sourceforge.net/wordpress/?p=2497)
 * [Bag of Words](http://en.wikipedia.org/wiki/Bag_of_words_model) (used in Bayesian Spam Filtering, document term frequency models)
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+### Statistical Definitions
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+* [Accuracy & Precision](http://en.wikipedia.org/wiki/Accuracy_and_precision) (relevant to classification, measuring efficacy of learned models)