A Counterfactual Explanation Framework for Retrieval Models

• URL: http://arxiv.org/abs/2409.00860v2
• Date: Tue, 10 Sep 2024 10:52:30 GMT
• Title: A Counterfactual Explanation Framework for Retrieval Models
• Authors: Bhavik Chandna, Procheta Sen,
• Abstract summary: We use an optimization framework to solve the question of which words played a role in not being favored by a retrieval model for a particular query. Our experiments show the effectiveness of our proposed approach in predicting counterfactuals for both statistical (e.g. BM25) and deep-learning-based models.
• Score: 4.562474301450839
• License:
• Abstract: Explainability has become a crucial concern in today's world, aiming to enhance transparency in machine learning and deep learning models. Information retrieval is no exception to this trend. In existing literature on explainability of information retrieval, the emphasis has predominantly been on illustrating the concept of relevance concerning a retrieval model. The questions addressed include why a document is relevant to a query, why one document exhibits higher relevance than another, or why a specific set of documents is deemed relevant for a query. However, limited attention has been given to understanding why a particular document is considered non-relevant to a query with respect to a retrieval model. In an effort to address this gap, our work focus on the question of what terms need to be added within a document to improve its ranking. This in turn answers the question of which words played a role in not being favored by a retrieval model for a particular query. We use an optimization framework to solve the above-mentioned research problem. % To the best of our knowledge, we mark the first attempt to tackle this specific counterfactual problem. Our experiments show the effectiveness of our proposed approach in predicting counterfactuals for both statistical (e.g. BM25) and deep-learning-based models (e.g. DRMM, DSSM, ColBERT).

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