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INF encountered when using sampling with temperature.

huggingface/transformers#19509·166457·Python·1407 天未动·3 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

### System Info latest transformers version == 4.24.0 When generating samples with mBART, I encounter this problem: ![image](https://user-images.githubusercontent.com/10862038/195253207-8229466b-8342-458d-ac40-0b40edd801af.png) Looking deeply into the codes, I find the problem roots from the beam score added to next_token_scores here: https://github.com/huggingface/transformers/blob/bc21aaca789f1a366c05e8b5e111632944886393/src/transformers/generation_utils.py#L2566 The original value of beam_scores is 0, but when using temperature like 0.5, the score is also divided the temperature value in logit_warper and gets larger and larger. And finally it causes the overflow of next_token_scores. ### Who can help? @patrickvonplaten @Narsil @gante ### Information - [ ] The official example scripts - [X] My own modified scripts ### Tasks - [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...) - [ ] My own task or dataset (give details below) ### Reproduction **I provide a simple code that can reproduce this issue.** import transformers from transformers import AutoTokenizer, AutoModelForSeq2SeqLM tokenizer = AutoTokenizer.from_pretrained("facebook/mbart-large-50-many-to-many-mmt") model = AutoModelForSeq2SeqLM.from_pretrained("facebook/mbart-large-50-many-to-many-mmt") model = model.cuda() src = 'In einem Notruf erzählte Professor Shannon Lamb mit einer etwas zittrigen Stimme der Polizei, dass er seine Freundin erschossen habe und dass die Beamten zu seinem Haus kommen müssten.' encoded_hi = tokenizer(src, return_tensors="pt", padding=True).to('cuda') # do_sample=True generated_tokens = model.generate(**encoded_hi, forced_bos_token_id=tokenizer.lang_code_to_id['en_XX'], temperature=0.5, do_sample=True, num_beams=10, num_return_sequences=10) tgt_txt = tokenizer.batch_decode(generated_tokens, skip_special_tokens=True) ### Expected behavior I think this should be solved but I'm not sure about the effect of the beam_scores.
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