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• W1837877215 abstract "The performance of nearest neighbor methods is degraded by the presence of hubs, i.e., objects in the dataset that are similar to many other objects. In this paper, we show that the classical method of centering, the transformation that shifts the origin of the space to the data centroid, provides an effective way to reduce hubs. We show analytically why hubs emerge and why they are suppressed by centering, under a simple probabilistic model of data. To further reduce hubs, we also move the origin more aggressively towards hubs, through weighted centering. Our experimental results show that (weighted) centering is effective for natural language data; it improves the performance of the k-nearest neighbor classi- fiers considerably in word sense disambiguation and document classification tasks." @default.
• W1837877215 created "2016-06-24" @default.
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• W1837877215 date "2013-10-01" @default.
• W1837877215 modified "2023-10-18" @default.
• W1837877215 title "Centering Similarity Measures to Reduce Hubs" @default.
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