How useful is Real Analysis for Machine Learning? • /r/MachineLearning

The truth is, unless your research area is a very certain subset of machine learning that is not very popular these days, it is unnecessary to take any math-focused class not given by an ML-focused professor. The level of (even) a graduate class will not be enough for you to understand the research-level concepts, and as such I think it would be better to study recent research papers rather than to spend time worrying about the assignments/midterm/final of a class.