The Kernel interface¶

class mklaren.kernel.kinterface.Kinterface(data, kernel, kernel_args={}, data_labels=None, row_normalize=False)¶

Interface to invoke kernels. Acts as a wrapper for a unified use of kernel functions/matrices by implementing __getitem__ and __call__.

Required for methods that only require access to parts of the kernel matrix.

__call__(x, y)¶

Mimic a callable kernel function.

Parameters:	x – (`numpy.ndarray`) Data point. y – (`numpy.ndarray`) Data point.
Returns:	(`float`) Value of the kernel for x, y.

__getitem__(item)¶

Access portions of the kernel matrix generated by kernel.

Parameters:	item – (`tuple`) pair of: indices or list of indices or (`numpy.ndarray`) or (`slice`) to address portions of the kernel matrix.
Returns:	(`numpy.ndarray`) Value of the kernel matrix for item.

diag()¶

Diagonal of the kernel matrix.

\[\mathbf{d}_i = k(\mathbf{x}_i, \mathbf{x}_i)\]

:return (numpy.ndarray) diagonal values of the kernel matrix.