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Is it possible to preprocess the training set first and then create a validation set from it?

By Sde221876gmailcom, a year ago
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When using a train and test set for machine learning, should I apply preprocessing steps such as scaling and imputation to the entire training set before splitting it into train and validation subsets, or should I split the training set first and then perform preprocessing on the training subset before evaluating the model on the validation set?"

Machine learning
Split the training set
Preprocessing
Splitting
Validation
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