## Description ##
The function computes the poisson's negative log likelihood loss that serves as 
measurement of the loss accrued from a Poisson regression prediction made by 
the model.

## Checklist ##
### Essentials ###
Please feel free to remove inapplicable items for your PR.
- [ ] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the 
relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) 
created (except PRs with tiny changes)
- [ ] Changes are complete (i.e. I finished coding on this PR)
- [ ] All changes have test coverage:
- Unit tests are added for small changes to verify correctness (e.g. adding a 
new operator)

- [ ] Code is well-documented: 

- [ ] To the my best knowledge, examples are either not affected by this 
change, or have been fixed to be compatible with this change

### Changes ###
- [ ] PoissonNLLLoss computation function tests, (and when applicable, API doc)


## Comments ##
- If this change is a backward incompatible change, why must this change be 
made.



[ Full content available at: 
https://github.com/apache/incubator-mxnet/pull/12697 ]
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