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I am working on a regression project. But I am facing the problem of covariate shift in features due to time delay.Test data was collected a year later due to which there has been some change in distribution. The research paper that I am working on also mentioned this shift in feature values but didn't mention anything about rectifying it.

I found this but it talks about changing the training set distribution. What I need is a way to make test data distribution closer to training data or some other way in which I could control for it.

I am using sklearn and Elastic-net for regression.

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