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L1 norm V/S L2 norm

 L1 norm V/S L2 norm

L2 norm is used when you known each and every column is well correlated to output
L1 norm is used when you known some columns are useful and some not


NOTE-> But they are not for very big data because you can't know you have to use L1 norm or L2 norm.This problem solved by elastic regression

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