machine learning - Calculating TP,FP,TN,FN for multiple class label in decision tree -

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i beginner in machine learning , classification, tried code decision tree algorithm prediction of 2 classes.it worked well, problem facing , if try predict more 2 class labels,?? how calculate precision , recall dataset having 5 classes.. came know , can possible calculating precision , recall values classes , taking average of that, can me how need calculate tp,tn,fp,fn if have 5 classes?

what false positive on non-binary problem be?

you asking not defined.

you can compute precision, recall, , f1.


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