Summary of Changes

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This pull request refactors the loading mechanism for C++ helper functions to ensure they are consistently available across all distributed processes. It transitions from local imports within functions to a globally managed helper object, improving efficiency and consistency. Additionally, it cleans up an unused import and type hint related to AutoConfig in the training utilities.

Highlights

• C++ Helper Loading Refactor: The C++ helper functions are now loaded into a global _HELPERS variable, ensuring consistent access across processes and avoiding repeated imports within functions.
• Distributed Helper Initialization: The compile_helpers function has been updated to ensure that the C++ extensions are compiled and loaded by all distributed processes (rank 0 first, then others after a barrier), making them available globally.
• Dependency Cleanup: The unused AutoConfig import from transformers and its corresponding type hint in the get_model_tflops function have been removed from train_utils.py, streamlining dependencies.

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