FIX: Generating with mixed adapter batches and with beam search enabled #2287
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See huggingface#2283 Right now, using mixed adapter batches with beam search generations does not work. This is because users need to pass the adapter names associated with each sample, i.e. the number of adapter names should be identical to the number of samples in the input. When applying beam search, transformers internally repeats the samples once per beam (or so it looks like). Therefore, we have more samples during generation than samples in the input. Consequently, the adapter names have to be extended accordingly. This is now taken care of. Unfortunately, this does not work for encoder-decoder models yet. With these models, there is always a size mismatch, whether adapter names are extended or not. What I suspect is happening is that only the decoder needs to be extended, but right now I don't see a way to implement this distinction in PEFT. Therefore, encoder-decoder + beam search generations is not supported for the time being.
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See #2283
Right now, using mixed adapter batches (introduced in #1558) with beam search generations does not work. This is because users need to pass the adapter names associated with each sample, i.e. the number of adapter names should be identical to the number of samples in the input.
When applying beam search, transformers internally repeats the samples once per beam (or so it looks like). Therefore, we have more samples during generation than samples in the input. Consequently, the adapter names have to be extended accordingly. This is now taken care of.
For encoder-decoder models, we need to be careful. I seems like only the decoder needs to be extended, whereas the encoder receives the original number of inputs. Therefore, when an encoder-decoder model is identified, the extension is only applied to the decoder part.