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R2

The coefficient of determination: how much better the model is than always predicting the mean, as a unitless score.

Members

Member	What it does
R2.Score	One score for the whole prediction: 1 minus the residual variance over the truth's variance.
R2.PerOutput	One score per output, unreduced.
R2.VarianceWeighted	One score, each output counted in proportion to how much its own truth varies.