Vikas89 commented on issue #13515: MKLDNN Perplexity Issue URL: https://github.com/apache/incubator-mxnet/issues/13515#issuecomment-444230531 @ pengzhao-intel We see the regression happening on LSTM on PTB data with symbolic training The graph shows that training & validation perplexity increased starting from 11/28 , which is matching with the date of fix of LSTM regression issue. We do see improvement in speed. There is huge drop in training time which I am skeptical about. <img width="1375" alt="screen shot 2018-12-04 at 11 36 40 am" src="https://user-images.githubusercontent.com/1817689/49468260-4432f200-f7b9-11e8-9623-3f6b7b84e988.png";>
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