DeLTa: A Decoding Strategy based on Logit Trajectory Prediction Improves Factuality and Reasoning Ability

• URL: http://arxiv.org/abs/2503.02343v1
• Date: Tue, 04 Mar 2025 07:07:17 GMT
• Title: DeLTa: A Decoding Strategy based on Logit Trajectory Prediction Improves Factuality and Reasoning Ability
• Authors: Yunzhen He, Yusuke Takase, Yoichi Ishibashi, Hidetoshi Shimodaira,
• Abstract summary: This paper proposes a novel decoding strategy aimed at enhancing both factual accuracy and inferential reasoning.<n>Our approach adjusts next-token probabilities by analyzing the trajectory of logits from lower to higher layers in Transformers.<n> Experiments on TruthfulQA demonstrate that DeLTa attains up to a 4.9% improvement over the baseline.
• Score: 3.2561294196141835
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large Language Models (LLMs) are increasingly being used in real-world applications. However, concerns about the reliability of the content they generate persist, as it frequently deviates from factual correctness or exhibits deficiencies in logical reasoning. This paper proposes a novel decoding strategy aimed at enhancing both factual accuracy and inferential reasoning without requiring any modifications to the architecture or pre-trained parameters of LLMs. Our approach adjusts next-token probabilities by analyzing the trajectory of logits from lower to higher layers in Transformers and applying linear regression. We find that this Decoding by Logit Trajectory-based approach (DeLTa) effectively reinforces factuality and reasoning while mitigating incorrect generation. Experiments on TruthfulQA demonstrate that DeLTa attains up to a 4.9% improvement over the baseline. Furthermore, it enhances performance by up to 8.1% on StrategyQA and 7.3% on GSM8K, both of which demand strong reasoning capabilities.

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