https://www.svds.com/learning-imbalanced-classes/

下采样即 从大类负类中随机取一部分，跟正类（小类）个数相同，优点就是降低了内存大小，速度快！

http://www.tuicool.com/articles/r2ee2ie

Learn more about SMOTE, see the original 2002 paper titled “ SMOTE: Synthetic Minority Over-sampling Technique “.

There are a number of implementations of the SMOTE algorithm, for example:

  • In Python, take a look at the “ UnbalancedDataset ” module. It provides a number of implementations of SMOTE as well as various other resampling techniques that you could try.
  • In R, the DMwR package provides an implementation of SMOTE.

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