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about the eval ppl on wiki2 with OPT #6

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@oujieww

Hello, I wonder if you can help me look at the following problem. I used your script to run the ppl verification, and ran it on the OPT-1.3B model in script/lut/eval_opt.sh. According to the results in your paper, LUT-GEMM has a ppl=49.10 in the wiki2 of W3A16 of OPT-1.3B, but using this script, I get ppl=68.56. I wonder if I have configured something wrong.

=========== quantize with original bcq method ===========

CUDA_VISIBLE_DEVICES=2 python model/opt.py
opt-1.3b
--wbits 3
--groupsize -1
--bcq
--bcq_round 50
--use_bst \

'wikitext2':68.55980682373047
'ptb': 112.10599517822266

=========== quantize with bcq+gptq method ===========

CUDA_VISIBLE_DEVICES=2 python model/opt.py
opt-1.3b
--wbits 3
--groupsize -1
--lut_eval
--bcq_round 50
--use_bst

'wikitext2':130.72769165039062
'ptb': 182.0449676513672

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