4.9 Environment and Distribution Drift

Covariate shift: That p(x|y) remains constant is an assumption we make, and we do so in circumstances where we believe that x causes y. Label shift: That p(y|x) remains constant is an assumption we make in cases where we believe that y causes x (disease symptoms). Model drifting: We may also have a third case, Concept drift, where the very definition of “y” may change. The only thing we can do is exploit knowledge of those variations being very gradual in time, space…