Fix nan issue in nemo1 / neva
<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module nemo.collections.multimodal.models.multimodal_llm.neva.neva_model
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:191:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:192:0: C0301: Line too long (139/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:323:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:852:0: C0301: Line too long (127/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:865:0: C0301: Line too long (136/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:867:0: C0301: Line too long (145/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1259:0: C0301: Line too long (194/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1263:0: C0301: Line too long (245/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1310:0: C0301: Line too long (124/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1394:0: C0301: Line too long (139/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1573:0: C0301: Line too long (148/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1696:0: C0301: Line too long (122/119) (line-too-long)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:113:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:133:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:146:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:163:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:184:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:187:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:251:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:300:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:310:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:507:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:548:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:565:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:581:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:610:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:671:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:725:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1179:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1185:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1287:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/multimodal/models/multimodal_llm/neva/neva_model.py:1626:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.61/10
```

---

Mitigation guide:

* Add sensible and useful docstrings to functions and methods
* For trivial methods like getter/setters, consider adding `# pylint: disable=C0116` inside the function itself
* To disable multiple functions/methods at once, put a `# pylint: disable=C0116` before the first and a `# pylint: enable=C0116` after the last.

By applying these rules, we reduce the occurance of this message in future.

Thank you for improving NeMo's documentation! [🤖]: Hi @yaoyu-33 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12398541875) for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.
# What does this PR do ?

Fix nan issue in nemo1 / neva.

**Collection**: [Note which collection this PR will affect]

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation

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[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Related to # (issue)
