solve codescan#57

[Liangyx2]

https://github.com/intel/intel-extension-for-transformers/security/code-scanning/57

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 Format Scan Tests workflow

Check ID	Status	Error details
format-scan (pylint)	success		✅
format-scan (bandit)	success		✅
format-scan (cloc)	success		✅
format-scan (cpplint)	success		✅

These checks are required after the changes to workflows/chatbot/inference/backend/fastrag/fastrag_service.py, workflows/chatbot/inference/requirements.txt.

🟢 Chat Bot Test workflow

Check ID	Status	Error details
call-inference-llama-2-7b-chat-hf / inference test	success		✅
call-inference-mpt-7b-chat / inference test	success		✅

These checks are required after the changes to workflows/chatbot/inference/backend/fastrag/fastrag_service.py, workflows/chatbot/inference/requirements.txt.

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