I observed a dramatic performance drop when using mxnet 1.2.1 + cuda8 + cudnn 
7.2.1 on 1080ti 
input_size = (448, 800)

mobilenet_v1 :  137 fps  -> 41 fps
mobilenet_v2 : 180 fps ->  57 fps

And it used a lot of gpu memory

Any advices?

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