RationalQuadratic
Rational Quadratic kernel.
The RationalQuadratic kernel can be seen as a scale mixture (an infinite sum) of RBF kernels with different characteristic length scales. It is parameterized by a length scale parameter \(l>0\) and a scale mixture parameter \(\alpha>0\). Only the isotropic variant where length_scale \(l\) is a scalar is supported at the moment. The kernel is given by:
Python Reference (opens in a new tab)
Constructors
constructor()
Signature
new RationalQuadratic(opts?: object): RationalQuadratic;Parameters
| Name | Type | Description |
|---|---|---|
opts? | object | - |
opts.alpha? | any | Scale mixture parameter Default Value 1 |
opts.alpha_bounds? | "fixed" | The lower and upper bound on ‘alpha’. If set to “fixed”, ‘alpha’ cannot be changed during hyperparameter tuning. |
opts.length_scale? | any | The length scale of the kernel. Default Value 1 |
opts.length_scale_bounds? | "fixed" | The lower and upper bound on ‘length_scale’. If set to “fixed”, ‘length_scale’ cannot be changed during hyperparameter tuning. |
Returns
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:23 (opens in a new tab)
Methods
__call__()
Return the kernel k(X, Y) and optionally its gradient.
Signature
__call__(opts: object): Promise<ArrayLike[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike[] | Left argument of the returned kernel k(X, Y) |
opts.Y? | ArrayLike[] | Right argument of the returned kernel k(X, Y). If undefined, k(X, X) if evaluated instead. |
opts.eval_gradient? | boolean | Determines whether the gradient with respect to the log of the kernel hyperparameter is computed. Only supported when Y is undefined. Default Value false |
Returns
Promise<ArrayLike[]>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:126 (opens in a new tab)
clone_with_theta()
Returns a clone of self with given hyperparameters theta.
Signature
clone_with_theta(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.theta? | ArrayLike | The hyperparameters |
Returns
Promise<any>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:177 (opens in a new tab)
diag()
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.
Signature
diag(opts: object): Promise<ArrayLike>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike[] | Left argument of the returned kernel k(X, Y) |
Returns
Promise<ArrayLike>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:217 (opens in a new tab)
dispose()
Disposes of the underlying Python resources.
Once dispose() is called, the instance is no longer usable.
Signature
dispose(): Promise<void>;Returns
Promise<void>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:109 (opens in a new tab)
init()
Initializes the underlying Python resources.
This instance is not usable until the Promise returned by init() resolves.
Signature
init(py: PythonBridge): Promise<void>;Parameters
| Name | Type |
|---|---|
py | PythonBridge |
Returns
Promise<void>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:65 (opens in a new tab)
is_stationary()
Returns whether the kernel is stationary.
Signature
is_stationary(opts: object): Promise<any>;Parameters
| Name | Type |
|---|---|
opts | object |
Returns
Promise<any>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:252 (opens in a new tab)
Properties
_isDisposed
boolean=false
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:21 (opens in a new tab)
_isInitialized
boolean=false
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:20 (opens in a new tab)
_py
PythonBridge
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:19 (opens in a new tab)
id
string
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:16 (opens in a new tab)
opts
any
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:17 (opens in a new tab)
Accessors
hyperparameter_alpha
Signature
hyperparameter_alpha(): Promise<any>;Returns
Promise<any>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:279 (opens in a new tab)
hyperparameter_length_scale
Signature
hyperparameter_length_scale(): Promise<any>;Returns
Promise<any>
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:303 (opens in a new tab)
py
Signature
py(): PythonBridge;Returns
PythonBridge
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:52 (opens in a new tab)
Signature
py(pythonBridge: PythonBridge): void;Parameters
| Name | Type |
|---|---|
pythonBridge | PythonBridge |
Returns
void
Defined in: generated/gaussian_process/kernels/RationalQuadratic.ts:56 (opens in a new tab)