eric-haibin-lin commented on issue #8980: CI System is warning of improper sparse tensor usage during tests. URL: https://github.com/apache/incubator-mxnet/issues/8980#issuecomment-350038461 No special build config is required for the sparse feature. The verbose warning message is on my list of things to fix. Most of the messages are expected as the tests indeed converts sparse ndarrays into dense ones. I need to suppress the warnings. The log is also there before the migration. With regard to the Cast operator, it indeed doesn't support sparse format because it's using the legacy operator interface instead of nnvm.
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