Papers by Lingyin Zhang
The Bidirectional Process Reward Model (2026.acl-long)
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| Challenge: | Process reward models (PRMs) assign fine-grained scores to intermediate reasoning steps within a solution trajectory. |
| Approach: | They propose a bidirectional evaluation paradigm that integrates a parallel evaluation stream alongside the L2R evaluation scheme and a gating mechanism to fuse the reward scores. |
| Outcome: | The proposed model surpasses unidirectional baselines in multiple benchmarks, LLM objectives and sampling policies. |