Learning general Gaussian kernel hyperparameters of SVMs using optimization on symmetric positive-definite matrices manifold. Laanaya, H., Abdallah, F., Snoussi, H., & Richard, C. Pattern Recognition Letters, 32(13):1511-1515, Elsevier, 2011.
Learning general Gaussian kernel hyperparameters of SVMs using optimization on symmetric positive-definite matrices manifold [pdf]Paper  bibtex   

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