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Computes F1 score from a confusion matrix, see confusion. The F1 score is defined as \(2 * TP/(2 * TP + FP + FN)\), where TP are true positives, FP are false positives, and FN are false negatives. If TP + FP + FN = 0, 1 is returned.
F1(confusion)
A numeric in [0,1].
Confusion matrix as obtained from confusion