tlby commented on issue #14874: [MXNET-1399] multiclass-mcc metric enhancements URL: https://github.com/apache/incubator-mxnet/pull/14874#issuecomment-489397088 I don't think it's absolutely necessary, but I definitely regret the name choice because while the implementation came from a discrete derivation of the Pearson correlation coefficient, all a user cares about is that it's a multiclass extension of Matthews correlation coefficient. When it comes to using these metrics Pearson is for continuous and Matthews is for discrete predictions. This metric is discrete so I feel it was misnamed. I later discovered that the formula I used is equivalent to one [mentioned in Wikipedia](https://en.wikipedia.org/wiki/Matthews_correlation_coefficient#Multiclass_case) as an extension of Matthews. Perhaps we should leave "pcc" as an alias for the sake of reverse compatibility?
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