sklearn.gaussian_process.kernels.Kernel

class sklearn.gaussian_process.kernels.Kernel [source]

Base class for all kernels.

New in version 0.18.

Attributes:	bounds Returns the log-transformed bounds on the theta. hyperparameters Returns a list of all hyperparameter specifications. n_dims Returns the number of non-fixed hyperparameters of the kernel. theta Returns the (flattened, log-transformed) non-fixed hyperparameters.

Methods

__call__(X[, Y, eval_gradient])	Evaluate the kernel.
clone_with_theta(theta)	Returns a clone of self with given hyperparameters theta.
diag(X)	Returns the diagonal of the kernel k(X, X).
get_params([deep])	Get parameters of this kernel.
is_stationary()	Returns whether the kernel is stationary.
set_params(**params)	Set the parameters of this kernel.

__init__($self, /, *args, **kwargs)

Initialize self. See help(type(self)) for accurate signature.

__call__(X, Y=None, eval_gradient=False) [source]

Evaluate the kernel.

bounds

Returns the log-transformed bounds on the theta.

Returns:	bounds : array, shape (n_dims, 2) The log-transformed bounds on the kernel’s hyperparameters theta

clone_with_theta(theta) [source]

Returns a clone of self with given hyperparameters theta.

Parameters:	theta : array, shape (n_dims,) The hyperparameters

diag(X) [source]

Returns the diagonal of the kernel k(X, X).

The result of this method is identical to np.diag(self(X)); however, it can be evaluated more efficiently since only the diagonal is evaluated.

Parameters:	X : array, shape (n_samples_X, n_features) Left argument of the returned kernel k(X, Y)
Returns:	K_diag : array, shape (n_samples_X,) Diagonal of kernel k(X, X)

get_params(deep=True) [source]

Get parameters of this kernel.

Parameters:	deep : boolean, optional If True, will return the parameters for this estimator and contained subobjects that are estimators.
Returns:	params : mapping of string to any Parameter names mapped to their values.

hyperparameters

Returns a list of all hyperparameter specifications.

is_stationary() [source]

Returns whether the kernel is stationary.

n_dims

Returns the number of non-fixed hyperparameters of the kernel.

set_params(**params) [source]

Set the parameters of this kernel.

The method works on simple kernels as well as on nested kernels. The latter have parameters of the form <component>__<parameter> so that it’s possible to update each component of a nested object.

Returns:	self

theta

Returns the (flattened, log-transformed) non-fixed hyperparameters.

Note that theta are typically the log-transformed values of the kernel’s hyperparameters as this representation of the search space is more amenable for hyperparameter search, as hyperparameters like length-scales naturally live on a log-scale.

Returns:	theta : array, shape (n_dims,) The non-fixed, log-transformed hyperparameters of the kernel