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Approximate Nearest Neighbor Search in high dimensional space is essential in DB and IR. Recently, NSG provides attractive theoretical analysis and achieves state-of-the-art performance. However, we find there are several limitations with NSG. In the theoretical aspect, NSG has no theoretical guarantee on searching for neighbors of not-in-database queries. In application, NSG is too sparse and thus has an inferior search performance. In addition, NSG's indexing complexity is also too high. To address above problems, we propose the Satel
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