catch prepack error and fallback to torch bf16

[Spycsh]

Type of Change

bug fix

Description

a solution to discussion #1506

Expected Behavior & Potential Risk

prepack error skipped

How has this PR been tested?

user's test

Dependency Change?

None

[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 intel_extension_for_transformers/neural_chat/models/model_utils.py, intel_extension_for_transformers/neural_chat/pipeline/plugins/retrieval/retrieval_agent.py.

🟢 NeuralChat Unit Test

Check ID	Status	Error details
neuralchat-unit-test-baseline	success		✅
neuralchat-unit-test-PR-test	success		✅
Generate-NeuralChat-Report	success		✅

These checks are required after the changes to intel_extension_for_transformers/neural_chat/models/model_utils.py, intel_extension_for_transformers/neural_chat/pipeline/plugins/retrieval/retrieval_agent.py.

🟢 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 intel_extension_for_transformers/neural_chat/models/model_utils.py, intel_extension_for_transformers/neural_chat/pipeline/plugins/retrieval/retrieval_agent.py.

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