zerolxf opened a new issue #13381: [Feature Request] Support CSRNDArray in kv_store URL: https://github.com/apache/incubator-mxnet/issues/13381 ## Description In distributed training, communication takes up a lot of time. In order to compress the communication time, an optimization method is to make the gradient sparse. But for now kv_store doesn't support push CSRNDArray values. Although support for this feature may cause other problems, right? For example, for CSRNDArray format >The format is designed for 2D matrices with a large number of columns, and each row is sparse
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