zerolxf opened a new issue #13372: Support sparse as return in topK? URL: https://github.com/apache/incubator-mxnet/issues/13372 ## Description why not support sparse as return in [topK](https://mxnet.incubator.apache.org/api/python/symbol/symbol.html#mxnet.symbol.topk)? When k is relatively small, it is very sparse. It is more efficient than "mask" and simpler than "both".Sparse in distributed transmission saves time. I want to implement the optimizer described in the paper *Sparsified SGD with Memory*, available at https://arxiv.org/abs/1809.07599
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