Remove unnecessary Sync#17201
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chengduoZH merged 1 commit intoPaddlePaddle:developfrom May 5, 2019
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It does not need sync all the device when the fetch_tensor is not empty, because there is sync calling in fetch_op_handle.
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It does not need sync all the device when the fetch_tensor is not empty, because there is
synccalling infetch_op_handle.