[GitHub] wkcn edited a comment on issue #12843: MXNet doesn't work with scipy int64

[GitBox <gi...@apache.org>]

wkcn edited a comment on issue #12843: MXNet doesn't work with scipy int64
URL: https://github.com/apache/incubator-mxnet/issues/12843#issuecomment-432537269
 
 
   The id of np.int64 in scipy is different from that in numpy.
   ```python
   import numpy as np
   import scipy as sp
   import mxnet as mx
   
   one = np.ones((2, 2), dtype='int64')
   sp_one = sp.sparse.csr_matrix(one).data
   
   print (np.dtype(sp_one.dtype).type)
   print (id(np.dtype(sp_one.dtype).type))
   
   print (np.dtype(np.int64).type)
   print (id(np.dtype(np.int64).type))
   
   print (np.int64)
   print (id(np.int64))
   ```
   
   ```bash
   <type 'numpy.int64'>
   139671667680256
   <type 'numpy.int64'>
   139671667680672
   <type 'numpy.int64'>
   139671667680672
   ```
   
   In SciPy, the dtype `np.int64` is upcasted to `np.longlong`.
   ```
   >>> np.int64 == np.longlong
   False
   >>> np.int64
   <class 'numpy.int64'>
   >>> np.longlong
   <class 'numpy.int64'>
   ```

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