remove useless patch

[wangxiyuan]

patach_config is useless now. Let's remove it

• vLLM version: v0.12.0
• vLLM main: https://github.com/vllm-project/vllm/commit/v0.12.0

[github-actions]

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[gemini-code-assist]

Code Review

This pull request proposes removing a monkey patch for SpeculativeConfig. While removing monkey patches is generally beneficial for maintainability, this patch contains critical logic for configuring speculative decoding on Ascend platforms. Removing it without ensuring this logic is handled elsewhere (either upstream in vllm or within the vllm-ascend codebase) could break speculative decoding functionality. I have raised a critical issue regarding the potential loss of this essential configuration logic.

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vllm_ascend/patch/platform/patch_config.py (1-234)

Removing this monkey patch for SpeculativeConfig.__post_init__ is concerning as it contains critical logic for configuring speculative decoding on Ascend. This includes auto-detecting the speculative method (e.g., 'eagle', 'medusa', 'deepseek_mtp') and setting up the draft_model_config.

If this logic has not been fully integrated into the upstream vllm's SpeculativeConfig or moved to another part of the vllm-ascend codebase, removing this file will likely break speculative decoding functionality.

For example, the following logic for method detection is being removed:

            elif "eagle-" in self.draft_model_config.model.lower():
                self.method = "eagle"
            elif "eagle3" in self.draft_model_config.model.lower():
                self.method = "eagle3"
            elif self.draft_model_config.hf_config.model_type == "medusa":
                self.method = "medusa"

Additionally, the logic for creating draft_model_config and other method-specific configurations is also being deleted.

Given the importance of this configuration logic, removing it without a clear replacement poses a significant risk. This change should be reverted unless it can be confirmed that this functionality is now handled elsewhere.