SSPO: Self-traced Step-wise Preference Optimization for Process Supervision and Reasoning Compression

• URL: http://arxiv.org/abs/2508.12604v1
• Date: Mon, 18 Aug 2025 04:02:15 GMT
• Title: SSPO: Self-traced Step-wise Preference Optimization for Process Supervision and Reasoning Compression
• Authors: Yuyang Xu, Yi Cheng, Haochao Ying, Zhuoyun Du, Renjun Hu, Xing Shi, Wei Lin, Jian Wu,
• Abstract summary: Post-training methods incur substantial computational overhead due to auxiliary models and overthinking.<n>We propose Self-traced Step-wise Preference Optimization (SSPO), a plug RLgable process supervision framework.<n>SSPO uses step-wise preference signals generated by the model itself to guide the optimization process for reasoning compression.
• Score: 15.87106741558898
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Test-time scaling has proven effective in further enhancing the performance of pretrained Large Language Models (LLMs). However, mainstream post-training methods (i.e., reinforcement learning (RL) with chain-of-thought (CoT) reasoning) often incur substantial computational overhead due to auxiliary models and overthinking. In this paper, we empirically reveal that the incorrect answers partially stem from verbose reasoning processes lacking correct self-fix, where errors accumulate across multiple reasoning steps. To this end, we propose Self-traced Step-wise Preference Optimization (SSPO), a pluggable RL process supervision framework that enables fine-grained optimization of each reasoning step. Specifically, SSPO requires neither auxiliary models nor stepwise manual annotations. Instead, it leverages step-wise preference signals generated by the model itself to guide the optimization process for reasoning compression. Experiments demonstrate that the generated reasoning sequences from SSPO are both accurate and succinct, effectively mitigating overthinking behaviors without compromising model performance across diverse domains and languages.

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