GRPO with reference-free rewards improves NLLB-200 translation quality on 13 languages up to +5.03 chrF++, competing with supervised fine-tuning on complex languages without target data.
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Reference-Free Reinforcement Learning Fine-Tuning for MT: A Seq2Seq Perspective
GRPO with reference-free rewards improves NLLB-200 translation quality on 13 languages up to +5.03 chrF++, competing with supervised fine-tuning on complex languages without target data.