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feature types:

• numerical
  • continuous
  • discrete
• categorical
• text/string
• image
• other non-numerical features often converted into numerical features to make them easier to work with

regression, classification

• regression: Y is a continuous number
  • multivariate regression
• classification: Y is categorical (mapped to an integer)

  • binary classification: $Y\in \{0,1\}$ or $Y\in \{-1,1\}$

  • multi-class classification: $Y\in \{0,1,\cdots ,k\}$

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