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<h1 class="function"> Kernel machines.</h1>
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 extraction  - (dir) Kernel feature extraction.
 preimage    - (dir) Pre-image problem for RBF kernel.

 <a href = "../kernels/diagker.html" target="mdsbody">diagker</a>     - Returns diagonal of kernel matrix.
 <a href = "../kernels/dualcov.html" target="mdsbody">dualcov