improve lm_eval get chatglm2 tokenizer from local saved files

[changwangss]

Type of Change

ticket https://jira.devtools.intel.com/browse/NLPTOOLKIU-1383
improve the tokenizer loading like the following code.

    tokenizer = AutoTokenizer.from_pretrained(
        "THUDM/chatglm2-6b", trust_remote_code=args.trust_remote_code
    )
    # save
    tokenizer.saved_pretrained("saved_results")

# load tokenizer
    tokenizer = AutoTokenizer.from_pretrained(
        args.model, trust_remote_code=args.trust_remote_code
    )

if args.model == "THUDM/chatglm2-6b", it works.
if args.model == "saved_results", it fails.

Description

detail description
JIRA ticket: xxx

Expected Behavior & Potential Risk

the expected behavior that triggered by this PR

How has this PR been tested?

how to reproduce the test (including hardware information)

Dependency Change?

any library dependency introduced or removed

[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/transformers/llm/evaluation/lm_eval/models/huggingface.py.

🟢 Optimize Unit Test workflow

Check ID	Status	Error details
optimize-unit-test-baseline	success		✅
optimize-unit-test-PR-test	success		✅
Genreate-OptimizeUT-Report	success		✅

These checks are required after the changes to intel_extension_for_transformers/transformers/llm/evaluation/lm_eval/models/huggingface.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/transformers/llm/evaluation/lm_eval/models/huggingface.py.

🟢 Engine Unit Test workflow

Check ID	Status	Error details
engine-unit-test-baseline	success		✅
engine-unit-test-PR-test	success		✅
Genreate-Engine-Report	success		✅

These checks are required after the changes to intel_extension_for_transformers/transformers/llm/evaluation/lm_eval/models/huggingface.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/transformers/llm/evaluation/lm_eval/models/huggingface.py.

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[chensuyue]

@XuehaoSun please verify this fix.