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Feature selection for NB

  • In general feature selection is necessary for multivariate Bernoulli NB.

  • Otherwise you suffer from noise, multi-counting

  • “Feature selection” really means something different for multinomial NB. It means dictionary truncation

    • The multinomial NB model only has 1 feature

  • This “feature selection” normally isn’t needed for multinomial NB, but may help a fraction with quantities that are badly estimated

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