einsum ToDO PyTorch Batch GPU Pytorch replace depthwise in real Network intro Wiki: https://en.wikipedia.org/wiki/Einstein_notation blog: https://ajcr.net/Basic-guide-to-einsum/ blocg 2: https://rockt.github.io/2018/04/30/einsum paper einconv code: https://github.com/pfnet-research/einconv/tree/master