With the latest cuDNN 7 release, a request of mine to the cuDNN team from just over a year ago has finally come to fruition - filter groups are now properly handled by the popular framework which provides accelerated code for common deep learning operations on Nvidia GPUs, according to the release notes:
Grouped Convolutions for models such as ResNeXt and Xception and CTC (Connectionist Temporal Classification) loss layer for temporal classification.
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