sxjscience commented on issue #9865: Confusing behavior of some evaluation metrics URL: https://github.com/apache/incubator-mxnet/issues/9865#issuecomment-368120147 I find this is actually a bug. The `pred` will be reshaped if it has ndim=1, see https://github.com/apache/incubator-mxnet/blob/master/python/mxnet/metric.py#L911-L912. In this case, the `pred` and the `label` have both shape (4,) and after reshaping, `pred.shape` will be changed to (4,1). `pred - label` will then generate an array with shape (4, 4) and give the incorrect output.
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