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• W2088032561 abstract "This paper collects some ideas targeted at advancing our understanding of the feature spaces associated with support vector (SV) kernel functions. We first discuss the geometry of feature space. In particular, we review what is known about the shape of the image of input space under the feature space map, and how this influences the capacity of SV methods. Following this, we describe how the metric governing the intrinsic geometry of the mapped surface can be computed in terms of the kernel, using the example of the class of inhomogeneous polynomial kernels, which are often used in SV pattern recognition. We then discuss the connection between feature space and input space by dealing with the question of how one can, given some vector in feature space, find a preimage (exact or approximate) in input space. We describe algorithms to tackle this issue, and show their utility in two applications of kernel methods. First, we use it to reduce the computational complexity of SV decision functions; second, we combine it with the kernel PCA algorithm, thereby constructing a nonlinear statistical denoising technique which is shown to perform well on real-world data." @default.
• W2088032561 created "2016-06-24" @default.
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• W2088032561 date "1999-01-01" @default.
• W2088032561 modified "2023-10-17" @default.
• W2088032561 title "Input space versus feature space in kernel-based methods" @default.
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• W2088032561 doi "https://doi.org/10.1109/72.788641" @default.
• W2088032561 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18252603" @default.
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