fix megatron weights sync

[hjh0119]

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[gemini-code-assist]

Summary of Changes

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This pull request addresses an issue with the Megatron model's weight synchronization process. The core change involves a significant refactoring of the underlying asynchronous communication logic, aiming to enhance reliability and simplify the handling of potential errors during weight transfer.

Highlights

• Weight Synchronization Refactor: The mechanism for synchronizing Megatron model weights has been refactored. The previous queue.Queue-based approach for sending weights asynchronously in a separate thread has been replaced with a more direct asyncio call within a dedicated thread, streamlining the process and improving error propagation.

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[gemini-code-assist]

Code Review

This pull request refactors the weight_generator function in src/twinkle/model/megatron/megatron.py to simplify the asynchronous weight sending mechanism. The previous queue-based producer-consumer pattern is replaced with a more direct approach where engine.send_weights is called asynchronously within a dedicated thread, with error handling managed via a result_container. A review comment suggests simplifying the manual asyncio event loop management by utilizing asyncio.run() for improved conciseness and robustness.