Created by: sfraczek

PR types

New features

PR changes

APIs

Describe

Adds use_mkldnn argument to ops, similarly to how use_cudnn is used. In Dygraph mode, setting global FLAGS_use_mkldnn=true enables mkldnn for all supported operators. If it is desired to have non-mkldnn op when FLAGS_use_mkldnn=true, it can be done by passing use_mkldnn=False to Op as argument.