Enhance 3.x torch algorithm entry

[yuwenzho]

Type of Change

feature
API changed or not: no

Description

Add new function preprocess_quantizer and postprocess_model to reduce duplicate code and fix bug in mixed algorithms.

For example:

- if getattr(model, "quantizer", False):
-     quantizer = model.quantizer
- else:
-     quantizer = RTNQuantizer(quant_config=weight_config)
+ quantizer = preprocess_quantizer(model, quantizer_cls=RTNQuantizer, quant_config=weight_config)

model = quantizer.execute(model, mode=mode)

- if getattr(model, "quantizer", False):
-     del model.quantizer
- else:
-     model.quantizer = quantizer
+ postprocess_model(model, mode, quantizer)

How has this PR been tested?

CI

Dependency Change?

No

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 Code Scan Tests workflow

Check ID	Status	Error details
Code-Scan	success		✅
Code-Scan (Bandit Code Scan Bandit)	success		✅
Code-Scan (DocStyle Code Scan DocStyle)	success		✅
Code-Scan (Pylint Code Scan Pylint)	success		✅

These checks are required after the changes to neural_compressor/torch/algorithms/base_algorithm.py, neural_compressor/torch/algorithms/weight_only/autoround.py, neural_compressor/torch/quantization/algorithm_entry.py, neural_compressor/torch/quantization/quantize.py, neural_compressor/torch/utils/utility.py.

🟢 Model Tests 3x workflow

Check ID	Status	Error details
Model-Test-3x	success		✅
Model-Test-3x (Generate Report GenerateReport)	success		✅
Model-Test-3x (Run PyTorch Model opt_125m_woq_gptq_int4)	success		✅
Model-Test-3x (Run PyTorch Model opt_125m_woq_gptq_int4_dq_bnb)	success		✅
Model-Test-3x (Run PyTorch Model opt_125m_woq_gptq_int4_dq_ggml)	success		✅

These checks are required after the changes to neural_compressor/torch/algorithms/base_algorithm.py, neural_compressor/torch/algorithms/weight_only/autoround.py, neural_compressor/torch/quantization/algorithm_entry.py, neural_compressor/torch/quantization/quantize.py, neural_compressor/torch/utils/utility.py.

🟢 Unit Tests 3x-PyTorch workflow

Check ID	Status	Error details
UT-3x-Torch	success		✅
UT-3x-Torch (Coverage Compare CollectDatafiles)	success		✅
UT-3x-Torch (Unit Test 3x Torch Unit Test 3x Torch)	success		✅
UT-3x-Torch (Unit Test 3x Torch baseline Unit Test 3x Torch baseline)	success		✅

These checks are required after the changes to neural_compressor/torch/algorithms/base_algorithm.py, neural_compressor/torch/algorithms/weight_only/autoround.py, neural_compressor/torch/quantization/algorithm_entry.py, neural_compressor/torch/quantization/quantize.py, neural_compressor/torch/utils/utility.py, test/3x/torch/quantization/weight_only/test_autoround.py, test/3x/torch/quantization/weight_only/test_mixed_algos.py.

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