Enable packed seqs for validation

[jiemingz]

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[cuichenx]

LGTM, just some documentation notes. It would be good to briefly describe the metadata format after self.pack_metadata = json.load(f)

[erhoo82]

@guyueh1 , @cuichenx
What is the status of this PR? Ready for merge?

[guyueh1]

LGTM

[cuichenx]

LGTM, thanks!

[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.gpt.data.packed_sequence
nemo/collections/llm/gpt/data/packed_sequence.py:116:0: C0301: Line too long (123/119) (line-too-long)
nemo/collections/llm/gpt/data/packed_sequence.py:111:0: C0115: Missing class docstring (missing-class-docstring)
************* Module nemo.collections.nlp.data.language_modeling.megatron.gpt_sft_dataset
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:71:0: C0301: Line too long (353/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:73:0: C0301: Line too long (173/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:74:0: C0301: Line too long (156/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:80:0: C0301: Line too long (157/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:83:0: C0301: Line too long (147/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:84:0: C0301: Line too long (178/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:85:0: C0301: Line too long (138/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:86:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:88:0: C0301: Line too long (144/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:91:0: C0301: Line too long (247/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:166:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:175:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:245:0: C0301: Line too long (137/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:248:0: C0301: Line too long (133/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:273:0: C0301: Line too long (146/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:278:0: C0301: Line too long (153/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:279:0: C0301: Line too long (155/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:301:0: C0301: Line too long (127/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:390:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:678:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:37:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/nlp/data/language_modeling/megatron/gpt_sft_dataset.py:527:0: C0115: Missing class docstring (missing-class-docstring)

-----------------------------------
Your code has been rated at 9.53/10

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[github-actions]

[🤖]: Hi @jiemingz 👋,

We wanted to let you know that a CICD pipeline 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