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Towards Analyzing and Understanding the Limitations of DPO: A Theoretical Perspective
April 9, 2024, 4:50 a.m. | Duanyu Feng, Bowen Qin, Chen Huang, Zheng Zhang, Wenqiang Lei
cs.CL updates on arXiv.org arxiv.org
Abstract: Direct Preference Optimization (DPO), which derives reward signals directly from pairwise preference data, has shown its effectiveness on aligning Large Language Models (LLMs) with human preferences. Despite its widespread use across various tasks, DPO has been criticized for its sensitivity to the SFT's effectiveness and its hindrance to the learning capacity towards human-preferred responses, leading to less satisfactory performance. To overcome those limitations, the theoretical understanding of DPO are indispensable but still lacking. To this …
abstract arxiv cs.ai cs.cl data direct preference optimization human language language models large language large language models limitations llms optimization perspective sensitivity sft tasks type understanding
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