GPTQ official

[sugunav14]

What does this PR do?

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Usage

# Add a code snippet demonstrating how to use this
python hf_ptq.py     --pyt_ckpt_path Qwen/Qwen3-8B     --qformat nvfp4_gptq     --kv_cache_qformat none     --dataset cnn_dailymail     --batch_size 32     --calib_seq 512     --calib_size 512    --export_path exported_model

Testing

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[codecov]

Codecov Report

❌ Patch coverage is 25.18519% with 101 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.39%. Comparing base (e024097) to head (8ebd924).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
modelopt/torch/quantization/model_calib.py	11.86%	52 Missing ⚠️
modelopt/torch/quantization/utils.py	19.14%	38 Missing ⚠️
modelopt/torch/utils/network.py	9.09%	10 Missing ⚠️
modelopt/torch/quantization/mode.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
- Coverage   73.73%   73.39%   -0.35%     
==========================================
  Files         196      196              
  Lines       20412    20583     +171     
==========================================
+ Hits        15050    15106      +56     
- Misses       5362     5477     +115     

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[sugunav14]

@Fridah-nv reference for sequential calibration
cc @realAsma