sxjscience commented on issue #18878:
URL:
https://github.com/apache/incubator-mxnet/issues/18878#issuecomment-670791217
OK, just realized that numpy does not support None either so it's expected.
```
~/miniconda3/lib/python3.7/site-packages/numpy/core/fromnumeric.py in sum(a,
axis, dtype, out, keepdims, initial, where)
2227
2228 return _wrapreduction(a, np.add, 'sum', axis, dtype, out,
keepdims=keepdims,
-> 2229 initial=initial, where=where)
2230
2231
~/miniconda3/lib/python3.7/site-packages/numpy/core/fromnumeric.py in
_wrapreduction(obj, ufunc, method, axis, dtype, out, **kwargs)
88 return reduction(axis=axis, out=out, **passkwargs)
89
---> 90 return ufunc.reduce(obj, axis, dtype, out, **passkwargs)
91
92
TypeError: an integer is required (got type NoneType)
```
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