Do LLMs Understand Collaborative Signals? Diagnosis and Repair

ArXi:2505.20730v4 Announce Type: replace-cross Collaborative information from user-item interactions is a fundamental source of signal in successful recommender systems. Recently, researchers have attempted to incorporate this knowledge into large language model-based recommender approaches (LLMRec) to enhance their performance. However, there has been little fundamental analysis of whether LLMs can effectively reason over collaborative information.