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由 Huihuang Zheng 提交于
1. Use CudnnWorkspaceHandle in exhaustive search of conv_cudnn. 2. For Ops using CudnnWorkspaceHandle in exhaustive search, release their GPU memory after exhaustive search. test=develop
b9494058
1. Use CudnnWorkspaceHandle in exhaustive search of conv_cudnn. 2. For Ops using CudnnWorkspaceHandle in exhaustive search, release their GPU memory after exhaustive search. test=develop