Perception Compressor:A training-free prompt compression method in long context scenarios

• URL: http://arxiv.org/abs/2409.19272v2
• Date: Wed, 6 Nov 2024 01:58:20 GMT
• Title: Perception Compressor:A training-free prompt compression method in long context scenarios
• Authors: Jiwei Tang, Jin Xu, Tingwei Lu, Zhicheng Zhang, Yiming Zhao, Lin Hai, Hai-Tao Zheng,
• Abstract summary: Perception is a training-free prompt compression method for large language models. It outperforms existing methods by a large margin, achieving state-of-the-art performance.
• Score: 17.720102137585503
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large Language Models (LLMs) demonstrate exceptional capabilities in various scenarios. However, they suffer from much redundant information and are sensitive to the position of key information (relevant to the input question) in long context scenarios, leading to inferior performance. To address these challenges, we present Perception Compressor, a training-free prompt compression method. It includes a perception retriever that leverages guiding questions and instruction to retrieve the most relevant demonstrations, a dual-slope ratio allocator to dynamically allocate compression ratios and open-book ratios, and a semi-guided iterative compression that retains key information at the token level while removing tokens that distract the LLM. We conduct extensive experiments on long context benchmarks, i.e., NaturalQuestions, LongBench, and MuSiQue. Experiment results show that Perception Compressor outperforms existing methods by a large margin, achieving state-of-the-art performance.

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