[CUBLAS, CUDNN] Support dynamic batch size #7194
Merged
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Similar to what's done in #6598, updated cublas and cudnn offload to enable them to take on dynamic batch size inputs.
Especially cublas is required for reasonable performance on PyTorch Faster RCNN / MaskRCNN, due to a large, dynamic batch dense layer they have.
please review @zhiics @comaniac @junrushao1994