Github user avulanov commented on the pull request:
https://github.com/apache/spark/pull/1155#issuecomment-46778186
The micro averaged Precision and Recall are equal for multiclass
classifier, because sum(fni)=sum(fpi), i.e. they are just the sum of all
non-diagonal elements in confusion matrix. F1-measure, as a harmonic mean of
teo equal numbers, also equals to P and R. For more details please refer to the
book "Introduction to IR" by Manning.
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