Xgbclassifier : what is the default loss function?

hi all,

i can’t find documentation on what the default loss function is for xgbclassifier? can somebody point me to this.

many thanks

multi:softprob for >= 3 classes, binary:logistic for binary classification.

@jiamingy thanks. am i right in thinking then that the loss function used for binary is binary cross entropy loss i.e. -y*log§-(1-y)log(1-p)