Nemo2 batcheval
State: closed | Pull request: yes
Labels: name: Run CICD

# What does this PR do ?
Adding evaluation of test set and write to file functions to llm.generate
```
data = llm.SquadDataModule(seq_length=2048, micro_batch_size=2, global_batch_size=8, num_workers=0)
data.prepare_data()
res = llm.generate(
        path=output_path,
        trainer=trainer,
        input_dataset=data,
        inference_params=CommonInferenceParams(num_tokens_to_generate=20, top_k=1),
        max_batch_size=4,
        output_path="test_prediction.txt",
    )
```


**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 
```

# GitHub Actions CI

The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.

The GitHub Actions CI will run automatically when the "Run CICD" label is added to the PR.
To re-run CI remove and add the label again.
To run CI on an untrusted fork, a NeMo user with write access must first click "Approve and run".

# Before your PR is "Ready for review"
**Pre checks**:
- [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?

Anyone in the community is free to review the PR once the checks have passed. 
[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)


<!-- 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.llm.api
nemo/collections/llm/api.py:75:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/llm/api.py:231:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/llm/api.py:362:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/llm/api.py:263:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:323:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:335:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:497:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.72/10
```

---

Thank you for improving NeMo's documentation!

[🤖]: Hi @HuiyingLi 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/11903049320) 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