fix session request with None tokenizer

[aurickq]

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[gemini-code-assist]

Summary of Changes

Hello @aurickq, 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 addresses a potential runtime issue where the tokenizer object might be None when creating a new session request, which could lead to errors when attempting to access tokenizer.vocab_size. The fix involves refactoring the create_req method to explicitly accept the vocab_size as an argument, which is then supplied by the scheduler using the model_config.vocab_size. This ensures that the vocab_size is always available and correctly passed, improving the stability of session request handling.

Highlights

• Explicit Vocab Size Passing: The create_req method in session_controller.py now explicitly accepts vocab_size as an integer argument, enhancing clarity and robustness.
• Scheduler Update: The scheduler.py file has been updated to pass self.model_config.vocab_size to the create_req method when creating a new request from an existing session.
• Tokenizer Dependency Removal: The session_controller no longer relies on the tokenizer object to retrieve vocab_size directly, making the process more resilient to scenarios where the tokenizer might be None.

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[Kangyan-Zhou]

/tag-and-rerun-ci

[gemini-code-assist]

Code Review

This pull request addresses a potential AttributeError when creating a session request if the tokenizer is None. The fix involves passing vocab_size explicitly from model_config to session.create_req, avoiding reliance on tokenizer.vocab_size. The changes are correct and well-targeted. I have one minor suggestion to add a type hint for better code clarity.

[Qiaolin-Yu]

/tag-and-rerun-ci