Adding MAE as a standard output for regression tasks #657
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Regression tasks out-of-the-box are showing only RMSE and R^2; MAE has been added. Given that a lot of algorithms working with L1 norms I think it will be beneficial for users to immediately be able to check absolute errors too. L1 is not some arcane specialised norm and I think adding MAE to the defaults will save valuable time (and potential bugs) for people writing their own cost functions to add MAE-like measures.