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• W3201233724 abstract "Open-domain question answering has exploded in popularity recently due to the success of dense retrieval models, which have surpassed sparse models using only a few supervised training examples. However, in this paper, we demonstrate current dense models are not yet the holy grail of retrieval. We first construct EntityQuestions, a set of simple, entity-rich questions based on facts from Wikidata (e.g., “Where was Arve Furset born?”), and observe that dense retrievers drastically under-perform sparse methods. We investigate this issue and uncover that dense retrievers can only generalize to common entities unless the question pattern is explicitly observed during training. We discuss two simple solutions towards addressing this critical problem. First, we demonstrate that data augmentation is unable to fix the generalization problem. Second, we argue a more robust passage encoder helps facilitate better question adaptation using specialized question encoders. We hope our work can shed light on the challenges in creating a robust, universal dense retriever that works well across different input distributions." @default.
• W3201233724 created "2021-09-27" @default.
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• W3201233724 date "2021-01-01" @default.
• W3201233724 modified "2023-09-29" @default.
• W3201233724 title "Simple Entity-Centric Questions Challenge Dense Retrievers" @default.
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• W3201233724 doi "https://doi.org/10.18653/v1/2021.emnlp-main.496" @default.
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