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Summary: Closes https://github.com/caffe2/caffe2/pull/1628

Differential Revision: D6579677

Pulled By: pietern

fbshipit-source-id: c53c0be06a342b12d1b1fcb35297ab9e792d4782

xzturn/caffe2,Yangqing/caffe2,Yangqing/caffe2,xzturn/caffe2,caffe2/caffe2,xzturn/caffe2,Yangqing/caffe2,Yangqing/caffe2,xzturn/caffe2,Yangqing/caffe2,xzturn/caffe2