Fix NotImplementedError

✅ Solution

The "NotImplementedError" in vllm usually arises when a specific model architecture or feature is not fully implemented within vllm's codebase, often in attention layers or sampling methods. To resolve this, either implement the missing functionality in the relevant modules (e.g., attention, sampling based on the traceback) or switch to a supported model/configuration; alternatively, contribute a patch with the necessary implementation to the vllm project. Also confirm you're using the latest version of vllm, as fixes may already be present.