from sklearn.impute import SimpleImputer imp = SimpleImputer(strategy=’constant’, fill_value=0) imp.fit_transform([[1, 2], [np.nan, 3]]) What is the output of this code?

Data Science Methodology Medium
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Key points

  • Constant strategy replaces missing values with a fixed scalar
  • SimpleImputer returns float arrays by default
  • np.nan is the standard representation for missing data

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