(factor())
True (observed) labels. Must have the same levels and length as response.

(factor())
Predicted response labels. Must have the same levels and length as truth.

(matrix())
Matrix of predicted probabilities, each column is a vector of probabilities for a specific class label. Columns must be named with levels of truth.

(numeric())
Non-negative sample weights. Must have the same levels and length as truth. Defaults to equal sample weights.

(numeric(1))
Value that should be returned if the measure is not defined for the input (as described in the note). Default is NaN.

(any)
Additional arguments. Currently ignored.