[MLLIB][WIP] SPARK-4638: Kernels feature for MLLIB#5503

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mandar2812 wants to merge 15 commits intoapache:masterfrom

mandar2812:kernels

Commits on Jan 24, 2015

Initial commit for Kernels feature: Contains class heirarchies, implementation of the Nystrom method for feature map extractions, RBF and Polynomial Kernels. Also a bare bones test suite for SVM Ke…
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1) Changes to class hierarchy 2) Commenting Nystrom approximation code
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Commits on Jan 27, 2015

Added optimal bandwidth selection procedure for Gaussian Density Kernel
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Commits on Jan 29, 2015

Entropy based subset selection done, unit tests passing
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Commits on Jan 31, 2015

1) Optimized code for feature map extraction, kernel matrix multiplication 2) Code indentation changes
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Commits on Feb 1, 2015

Minor edits to kernel test suite.
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Commits on Apr 13, 2015

Commits on Apr 14, 2015