Kan Wu created MXNET-1426:
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Summary: Fix the wrong result of sum(inf, inf) and mean(inf, inf)
Key: MXNET-1426
URL: https://issues.apache.org/jira/browse/MXNET-1426
Project: Apache MXNet
Issue Type: Bug
Components: Apache MXNet Backend
Reporter: Kan Wu
Hi, there.
I fix the wrong result of sum(inf, inf) and mean(inf, inf).
Test Case:
```python
import mxnet as mx
import numpy as np
x = mx.nd.array([np.inf, np.inf])
print(mx.nd.mean(x))
print(mx.nd.sum(x))
x = mx.nd.array([-np.inf, -np.inf])
print(mx.nd.mean(x))
print(mx.nd.sum(x))
x = mx.nd.array([np.inf, -np.inf])
print(mx.nd.mean(x))
print(mx.nd.sum(x))
```
The result should be `inf` rather than `nan`.
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