ZiyueHuang commented on issue #8259: check_format of sparse ndrray URL: https://github.com/apache/incubator-mxnet/pull/8259#issuecomment-343634820 The result err number will be returned to `SyncCheckFormat` in ndarray.cc and do the check there. `CheckFormatImpl` can be used in other OPs in backend. For the user side, the behavior is the same with scipy, i.e. `arr.check_format()` will raise error and the meaningful err message if the sparse arr is invalid. @piiswrong
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