On-policy distillation (OPD) has been widely studied as a post-training method in which a student model obtains token-level supervision from a stronger teacher on its own rollouts. Recent studies have improved OPD through alternative distillation reward formulations and teacher configurations, while the objective of di...
Jaehui Hwang, Dongyoon Han, Sangdoo Yun et al.· 0 citations
It is found that full trajectories provide only limited benefit, while partial trajectories are effective even under heavy truncation, and training LLMs using endpoints leads to consistent changes in reasoning behavior, and that it also benefits post-training methods based on reinforcement learning or on-policy distill...
Jaehui Hwang, Sangdoo Yun, Byeongho Heo et al.· 0 citations
This work finds that reasoning operations are separable in held-out representations, with separability peaking in middle layers, and verify that this structure is not explained by lexical or positional confounds.
Seogyeong Jeong, Jaehui Hwang, Dongyoon Han et al.· 0 citations
It is shown that the delta signal substantially improves on-policy distillation and the new distillation method is referred to as On-Policy Delta Distillation (OPD), enabling reasoning LLMs to achieve strong performance with only a short post-training period.
It is found that English-only OPD can also increase performance for Korean and Japanese, but often shifts the responses toward English, highlighting the importance of multilingual data to preserving target-language responses.
Byeongho Heo, Jaehui Hwang, Sangdoo Yun et al.· 0 citations
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