Add support for new autogptq quant_config.checkpoint_format #332
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Reason for PR: make sure loading of gptq marlin quants is compatible with latest autogptq
Due to autogpq update AutoGPTQ/AutoGPTQ#603 quants made with autogptq >=0.8.0-dev will use a new
checkpoint_format
property to holdmarlin
and future formats.Compat tested with both marlin and non-marlin in both old
is_marlin_format
and newcheckpoint_format
@merrymercy @hnyls2002 Ready for review.