ThomasDelteil commented on issue #9571: ACCURACY IS USING NUMPY, URGENT FIX URL: https://github.com/apache/incubator-mxnet/issues/9571#issuecomment-374285733 That seems pretty critical indeed. The previous PR wasn't correct, it was still doing the computation using asnumpy() because it was using asscalar() which behind the scenes is equivalent to asnumpy()[0]. The problem is at asnumpy() has a wait_on_read on the prediction, which blocks the next batch of data from being loaded on the GPU, whilst the data could be loaded while the predictions are computed and the metric is evaluated.
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