[megatron] compat megatron 0.17

[Jintao-Huang]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces compatibility for Megatron Core version 0.17.0rc0 and above by conditionally selecting checkpointing strategies. It also refactors imports, moving parallel_state to the top level and utilizing local imports for version-specific strategy functions. Feedback suggests making the version check more robust by using getattr to avoid potential AttributeError and refactoring the duplicated strategy selection logic into a helper function to improve maintainability.

[gemini-code-assist]

Accessing megatron.core.__version__ directly might raise an AttributeError if the attribute is missing in certain environments or older versions of Megatron Core. It is safer to use getattr with a default value to ensure the version check is robust.

Suggested change

	mcore_017 = version.parse(getattr(megatron.core, '__version__', '0.0.0')) >= version.parse('0.17.0rc0')

[gemini-code-assist]

The conditional logic for selecting the checkpointing strategy is duplicated in both save_mcore_checkpoint and load_mcore_checkpoint. Additionally, performing local imports inside these functions every time they are called is slightly inefficient, although acceptable for infrequent operations like checkpointing. Consider refactoring this into a helper function or using top-level imports with a try-except block to adhere better to PEP 8 and improve maintainability.