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[WIP] GPTQModel select quant linear with pack #2138

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[WIP] GPTQModel select quant linear with pack #2138

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LRL-ModelCloud
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@Qubitium
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This PR addresses the issue where GPTQModel is unable to auto-select the fastest quant linear (Marlin) due to missing information regarding if this model is loaded via pre-trained or from_quantized. Add pack=True requirement to hf_select_quant_linear (for pretrained quantization will solve this. Without the PR, user need to manually set backend="marlin" to use Marlin. This PR allows auto selection of Marlin, if compatible, in default auto mode.

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@LRL-ModelCloud @Qubitium