arXiv Computation and Language By Jihao Zhao, Shuaishuai Zu, Zhiyuan Ji, Chunlai Zhou, Biao Qin

Writer-R1: Dynamic Rubric Mining for Reinforcement Learning of Open-Ended Writing

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Writer‑R1 is a writing training pipeline that uses Inductive Rubric Generation (IRG) to automatically construct prompt‑specific rubrics for open‑ended writing tasks. The pipeline expands an open writing corpus, applies the generated rubrics during supervised training and reinforcement learning, and provides the rubrics to writers before generation. A compact model, RubricGen‑4B, can supply rubrics for new requests, and Writer‑R1 improves WritingBench and HelloBench scores over 4B and 8B backbones.

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