-
class sklearn.gaussian_process.kernels.DotProduct(sigma_0=1.0, sigma_0_bounds=(1e-05, 100000.0))
[source] -
Dot-Product kernel.
The DotProduct kernel is non-stationary and can be obtained from linear regression by putting N(0, 1) priors on the coefficients of x_d (d = 1, . . . , D) and a prior of N(0, sigma_0^2) on the bias. The DotProduct kernel is invariant to a rotation of the coordinates about the origin, but not translations. It is parameterized by a parameter sigma_0^2. For sigma_0^2 =0, the kernel is called the homogeneous linear kernel, otherwise it is inhomogeneous. The kernel is given by
k(x_i, x_j) = sigma_0 ^ 2 + x_i cdot x_j
The DotProduct kernel is commonly combined with exponentiation.
New in version 0.18.
Parameters: sigma_0 : float >= 0, default: 1.0
Parameter controlling the inhomogenity of the kernel. If sigma_0=0, the kernel is homogenous.
sigma_0_bounds : pair of floats >= 0, default: (1e-5, 1e5)
The lower and upper bound on l
Methods
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__(sigma_0=1.0, sigma_0_bounds=(1e-05, 100000.0))
[source]
-
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.
-
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
-
gaussian_process.kernels.DotProduct()
Examples using
2017-01-15 04:22:34
Please login to continue.