Efficient similarity search within user-specified projective subspaces |
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Affiliation: | 1. Beijing Institute of Technology, Beijing 100081, China;2. Beijing Key Laboratory of Embedded Real-time Information Processing Technology, Beijing 100081, China;3. Beijing Institute of Electronic System Engineering, Beijing 100089, China;4. School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China |
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Abstract: | Many applications — such as content-based image retrieval, subspace clustering, and feature selection — may benefit from efficient subspace similarity search. Given a query object, the goal of subspace similarity search is to retrieve the most similar objects from the database, where the similarity distance is defined over an arbitrary subset of dimensions (or features) — that is, an arbitrary axis-aligned projective subspace — specified along with the query. Though much effort has been spent on similarity search in fixed subspaces, relatively little attention has been given to the problem of similarity search when the dimensions are specified at query time. In this paper, we propose new methods for the subspace similarity search problem for real-valued data. Extensive experiments are provided showing very competitive performance relative to state-of-the-art solutions. |
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Keywords: | Subspace similarity search Multi-step search Intrinsic dimensionality |
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