keystoneml.nodes.learning

KernelMatrix

trait KernelMatrix extends AnyRef

Defines a wrapper to access elements of a symmetric distributed matrix that is generated using a kernel function.

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BlockKernelMatrix
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  1. abstract def apply(colIdxs: Seq[Int]): RDD[DenseMatrix[Double]]

    Extract specified columns from the kernel matrix.

    Extract specified columns from the kernel matrix. NOTE: This returns a *cached* RDD and unpersist should be called at the end of a block.

    colIdxs

    the column indexes to extract

    returns

    A sub-matrix of size n x idxs.size as an RDD.

  2. abstract def diagBlock(idxs: Seq[Int]): DenseMatrix[Double]

    Extract a diagonal block from the kernel matrix.

    Extract a diagonal block from the kernel matrix.

    idxs

    the column, row indexes to extract

    returns

    A local matrix of size idxs.size x idxs.size

  3. abstract def unpersist(colIdxs: Seq[Int]): Unit

    Clean up resources associated with a kernel block.

    Clean up resources associated with a kernel block.

    colIdxs

    column indexes corresponding to the block.

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