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As you can see we have 1 unmatched entity: "U.S." is a hallucinated entity in the summary, that does not exist in the article. Deep learning based generation is [prone to hallucinate](https://arxiv.org/pdf/2202.03629.pdf) unintended text. These hallucinations degrade system performance and fail to meet user expectations in many real-world scenarios. By applying entity matching, we can improve this problem for the downstream task of summary generation. |