[deploy] update vllm_enable_prefix_caching

[Jintao-Huang]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @Jintao-Huang, 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 refines the handling of the vllm_enable_prefix_caching parameter by changing its default value from an explicit False to None. This modification allows the system to align with vLLM's internal default settings for prefix caching, providing greater flexibility and potentially simplifying future updates. The changes include updates to the parameter's type hint in Python code and corresponding adjustments in the documentation to reflect this new default behavior and provide context for previous versions.

Highlights

• Default Value Change: The default value for the vllm_enable_prefix_caching parameter has been changed from False to None across the codebase. This allows the system to follow vLLM's default behavior for prefix caching.
• Type Hint Update: The type hint for enable_prefix_caching in relevant Python functions and argument definitions has been updated from bool to Optional[bool] to accommodate the new None default.
• Documentation Update: Both English and Chinese documentation for command-line parameters have been updated to reflect the new default behavior of vllm_enable_prefix_caching and to clarify its behavior in older ms-swift versions.
• Engine Argument Handling: The logic for passing enable_prefix_caching to the vLLM engine has been refined, now conditionally adding it to engine_kwargs only when explicitly set (i.e., not None).

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[gemini-code-assist]

Code Review

This pull request correctly updates the vllm_enable_prefix_caching parameter to default to None, allowing it to follow vLLM's default behavior. This change enhances flexibility and is consistently applied across the codebase, including engine implementations and documentation. I have one minor suggestion to improve the docstring for better code consistency.

[gemini-code-assist]

The type hint for vllm_enable_prefix_caching in the docstring should be updated to (Optional[bool]) to match the implementation change on line 198, where it is defined as Optional[bool] = None. This will improve consistency between the code and its documentation.

Suggested change

	vllm_enable_prefix_caching (bool): Flag to enable automatic prefix caching. Default is None.
	vllm_enable_prefix_caching (Optional[bool]): Flag to enable automatic prefix caching. Default is None.