Update to work using Llama 3

[JesusPaz]

What does this PR do ?

fix the script to convert llama3 from nemo to hf format.

Changelog

• Stop using LlamaTokenizer and start using AutoTokenizer from Transformers.

Usage

python3 NeMo/scripts/checkpoint_converters/convert_llama_nemo_to_hf.py \
    --input_name_or_path llama3-8b.nemo \
    --output_path llama3-8b-hf/pytorch_model.bin \
    --hf_input_path Meta-Llama-3-8B \
    --hf_output_path llama3-8b-hf \
    --input_tokenizer Meta-Llama-3-8B \
    --hf_output_tokenizer llama3-8b-hf

you must except something like this when the script finishes:

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The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.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
• 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 contains specific people who can review PRs to various areas.

Additional Information

• there is an issue in hf related but is not the same script https://huggingface.co/meta-llama/Meta-Llama-3-8B-Instruct/discussions/37