llama 3.1 has correct max_seq_len for all versions

[akashc1]

Context

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Please link to any issues this PR addresses. #2202

Changelog

What are the changes made in this PR?

• Ensure all llama 3.1 instantiations uses the correct max_seq_len the model was originally trained with based on the HF config

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/2203

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[felipemello1]

thanks for the PR, do you mind updating the docstrings too, so they include the new arg? I think that for 405B the default is wrong, it should be 131k.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.85%. Comparing base (aa8f365) to head (d2f581c).

Additional details and impacted files

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  Coverage   23.85%   23.85%           
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  Files         344      344           
  Lines       20658    20658           
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  Hits         4928     4928           
  Misses      15730    15730           

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[RdoubleA]

This seems inconsistent with our other builders, which do not specify a max seq len parameter. If you want to change the default max seq len for llama3_1 you should use the base builder llama3_1() instead of the 8b and 405b builders, as they're meant to expose minimal parameters and give all the defaults to get the correct model. But let us know if this is too prohibitive.

[akashc1]

@felipemello1 @RdoubleA thank you for the comments, can you please check the updated implementation? I set the correct default from the HF model config for Llama 3.1 models in the _model_builders file.