Zero-Shot Dense Retrieval with Embeddings from Relevance Feedback

• URL: http://arxiv.org/abs/2410.21242v1
• Date: Mon, 28 Oct 2024 17:40:40 GMT
• Title: Zero-Shot Dense Retrieval with Embeddings from Relevance Feedback
• Authors: Nour Jedidi, Yung-Sung Chuang, Leslie Shing, James Glass,
• Abstract summary: We introduce Real Document Embeddings from Relevance Feedback (ReDE-RF) Inspired by relevance feedback, ReDE-RF proposes to re-frame hypothetical document generation as a relevance estimation task. Our experiments show that ReDE-RF consistently surpasses state-of-the-art zero-shot dense retrieval methods.
• Score: 17.986392250269606
• License:
• Abstract: Building effective dense retrieval systems remains difficult when relevance supervision is not available. Recent work has looked to overcome this challenge by using a Large Language Model (LLM) to generate hypothetical documents that can be used to find the closest real document. However, this approach relies solely on the LLM to have domain-specific knowledge relevant to the query, which may not be practical. Furthermore, generating hypothetical documents can be inefficient as it requires the LLM to generate a large number of tokens for each query. To address these challenges, we introduce Real Document Embeddings from Relevance Feedback (ReDE-RF). Inspired by relevance feedback, ReDE-RF proposes to re-frame hypothetical document generation as a relevance estimation task, using an LLM to select which documents should be used for nearest neighbor search. Through this re-framing, the LLM no longer needs domain-specific knowledge but only needs to judge what is relevant. Additionally, relevance estimation only requires the LLM to output a single token, thereby improving search latency. Our experiments show that ReDE-RF consistently surpasses state-of-the-art zero-shot dense retrieval methods across a wide range of low-resource retrieval datasets while also making significant improvements in latency per-query.

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