[C++] fix helpers import

[mayank31398]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mayank31398, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

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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[gemini-code-assist]

Code Review

The pull request addresses an issue with C++ helper imports by refactoring the compilation and usage of these helpers. It introduces a global variable _HELPERS to store the compiled extension, preventing repeated imports. Additionally, it cleans up an unused import and refines a type hint in train_utils.py. The core change correctly moves from local imports to a global reference for the compiled C++ extension, which is a good step towards efficient resource management.