[GitHub] reminisce commented on issue #8668: Precision error setting NDArray from np.float32 scalar

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

reminisce commented on issue #8668: Precision error setting NDArray from np.float32 scalar
URL: https://github.com/apache/incubator-mxnet/issues/8668#issuecomment-346197743
 
 
   When assigning a scalar value to an NDArray, the scalar is passed to the backend as a parameter, rather than an `NDArray`. This leads to converting the scalar to a python string and converting the python string to a `ctypes.c_char_p` in the frontend. After tracing the code, it's found that the scalar's last two digits were truncated when it reaches here: https://github.com/apache/incubator-mxnet/blob/master/src/c_api/c_api_ndarray.cc#L140
   
   while it was still good in the frontend before reaching here:
   https://github.com/apache/incubator-mxnet/blob/master/python/mxnet/_ctypes/ndarray.py#L83
   
   So it looks like a bug in `ctypes` converting floats to strings.
   
   @cjolivier01 is looking into this for more details.

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