[scikit-learn] Why is cross_val_predict discouraged?

[Joel Nothman]

> I assume that you want to tell that it is not wise to compute TP, FP, FN
and then precision and recall using cross_val_predict. If this is what you
mean, I'd like you to explain why.

Because if there is high variance as a function of training set rather than
test sample I'd like to know.

> The pooled mean is the correct metric in this case.

I don't think we are in agreement on that.
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