The Minimum Volume Ellipsoid Metric
The Minimum Volume Ellipsoid Metric
复制标题
最小体积椭球度量
DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
F. Ferrie
中科院分区:
文献类型:
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作者:
Karim Abou;F. Ferrie
We propose an unsupervised "local learning" algorithm for learning a metric in the input space. Geometrically, for a given query point, the algorithm finds the minimum volume ellipsoid (MVE) covering its neighborhood which characterizes the correlations and variances of its neighborhood variables. Algebraically, the algorithm maximizes the determinant of the local covariance matrix which amounts to a convex optimization problem. The final matrix parameterizes a Mahalanobis metric yielding the MVE metric (MVEM). The proposed metric was tested in a supervised learning task and showed promising and competitive results when compared with state of the art metrics in the literature.