[WIP] [v4] refactor megatron-swift (use megatron-core)

[Jintao-Huang]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the initialization process for Megatron within the megatron-swift module. It streamlines the environment setup by removing the dynamic installation of Megatron-LM and renames a key initialization function for better clarity, aligning with a direct usage of megatron-core.

Highlights

• Function Renaming: The internal _patch_megatron function has been renamed to init_megatron_env to better reflect its purpose of initializing the Megatron environment.
• Megatron-LM Installation Logic Removed: The code responsible for dynamically cloning and installing Megatron-LM from GitHub (specifically the core_r0.15.0 branch) has been removed. This suggests that megatron-core is now expected to be pre-installed or managed externally, simplifying the environment setup within this module.

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[gemini-code-assist]

Code Review

This pull request refactors the Megatron environment initialization. The function _patch_megatron is renamed to init_megatron_env, improving clarity and making it public. The old init_megatron_env function, which dynamically installed Megatron-LM, has been removed. This is a significant improvement, simplifying the setup by relying on a pre-installed megatron-core package, which is a better practice for dependency management. The changes are well-justified and improve the code structure. As a minor follow-up, some imports in swift/megatron/init.py have become unused due to this refactoring and could be removed in a subsequent change.