What is the difference between L1 regularization (Lasso) and L2 regularization (Ridge)?

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What is the difference between L1 regularization (Lasso) and L2 regularization (Ridge)?

Key points

  • L1 drives coefficients to exactly zero for sparsity
  • L2 rarely drives coefficients to zero
  • L1 penalizes absolute weights; L2 penalizes squared weights
  • L1 is Lasso; L2 is Ridge

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