Nemo2 batcheval

[HuiyingLi]

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]

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[github-actions]

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

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

************* Module nemo.collections.llm.api
nemo/collections/llm/api.py:68:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/llm/api.py:224:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/llm/api.py:355:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/llm/api.py:256:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:316:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:328:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:490:0: C0116: Missing function or method docstring (missing-function-docstring)

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

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