wuxun-zhang commented on issue #15767: FullyConnected op with float64 and MKL-DNN fails if gradient are not set in a specific way URL: https://github.com/apache/incubator-mxnet/issues/15767#issuecomment-519106862 Seems that there are no data type check for MKL-DNN stateful RNN implementation (see https://github.com/apache/incubator-mxnet/blob/master/src/operator/rnn.cc#L226). So, when input data is `float64`, mkldnn rnn pass still be executed and then `unknown mkldnn type` error will be got.
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