For the classification problem (linear/logistic regression) in machine learning, generally there is no constraint for the problem formulation. I am wondering if there are some formulations with constraints for the variables?
Constrained regression is common in some areas. For details see this link. Best, David
https://www.google.com/search?q=constrained+regression&ie=utf-8&oe=utf-8&client=firefox-b-1
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