rahul003 commented on issue #9774: mx.io.ImageRecordIter does not respect dtype 
argument / FP16 performance on Volta
   Both suggestions didn't help improve the speed unforunately. Using 
MXNET_CUDNN_AUTOTUNE_DEFAULT=2 helped in some cases. But we can't say this 
setting helps consistently. If it picks the fastest, why would it not help in 
all cases? I understand cases where it should be same speed as other algos. But 
sometimes, this is slower than setting it to 1. All else should remain same, 

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