[GitHub] djl11 commented on issue #11424: Add support for numpy.nonzero() to ndarray

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djl11 commented on issue #11424: Add support for numpy.nonzero() to ndarray
URL: https://github.com/apache/incubator-mxnet/issues/11424#issuecomment-460253701
 
 
   You can achieve this affect by creating a CSRNDArray, as explained [here](https://github.com/apache/incubator-mxnet/blob/master/docs/tutorials/sparse/csr.md).
   
   If you have a 2D array which contains zeros, you can convert this to a csr array like so:
   `some_array = some_array.tostype('csr')`
   
   you can then extract the indices of the non-zero entries like so:
   `some_array.indices`
   
   This is not to say that a non-zero function directly in mx.nd wouldn't be useful, but this is a good current solution for anybody who is searching.

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