dpo-trainer

problem

python gemma huggingface trl dpo-trainer multimodal fine-tuning

114 tok

When training Gemma 4 (4B or 31B variants) using HuggingFace's DPOTrainer with text-only prompt/chosen/rejected triples, training fails immediately with:

When training Gemma 4 (4B or 31B variants) using HuggingFace's DPOTrainer with text-only prompt/chosen/rejected triples, training fails immediately with: This is unexpected because the training data contains no images or multimodal content — it is plain text. The error does not appear in…

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