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Module Kernel_approximation.SkewedChi2SamplerSource

Sourcetype tag = [
  1. | `SkewedChi2Sampler
]
Sourcetype t = [ `BaseEstimator | `Object | `SkewedChi2Sampler | `TransformerMixin ] Obj.t
Sourceval of_pyobject : Py.Object.t -> t
Sourceval to_pyobject : [> tag ] Obj.t -> Py.Object.t
Sourceval as_transformer : t -> [ `TransformerMixin ] Obj.t
Sourceval as_estimator : t -> [ `BaseEstimator ] Obj.t
Sourceval create : ?skewedness:float -> ?n_components:int -> ?random_state:int -> unit -> t

Approximates feature map of the 'skewed chi-squared' kernel by Monte Carlo approximation of its Fourier transform.

Read more in the :ref:`User Guide <skewed_chi_kernel_approx>`.

Parameters ---------- skewedness : float 'skewedness' parameter of the kernel. Needs to be cross-validated.

n_components : int number of Monte Carlo samples per original feature. Equals the dimensionality of the computed feature space.

random_state : int, RandomState instance or None, optional (default=None) Pseudo-random number generator to control the generation of the random weights and random offset when fitting the training data. Pass an int for reproducible output across multiple function calls. See :term:`Glossary <random_state>`.

Examples -------- >>> from sklearn.kernel_approximation import SkewedChi2Sampler >>> from sklearn.linear_model import SGDClassifier >>> X = [0, 0], [1, 1], [1, 0], [0, 1] >>> y = 0, 0, 1, 1 >>> chi2_feature = SkewedChi2Sampler(skewedness=.01, ... n_components=10, ... random_state=0) >>> X_features = chi2_feature.fit_transform(X, y) >>> clf = SGDClassifier(max_iter=10, tol=1e-3) >>> clf.fit(X_features, y) SGDClassifier(max_iter=10) >>> clf.score(X_features, y) 1.0

References ---------- See 'Random Fourier Approximations for Skewed Multiplicative Histogram Kernels' by Fuxin Li, Catalin Ionescu and Cristian Sminchisescu.

See also -------- AdditiveChi2Sampler : A different approach for approximating an additive variant of the chi squared kernel.

sklearn.metrics.pairwise.chi2_kernel : The exact chi squared kernel.

Sourceval fit : ?y:Py.Object.t -> x:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> t

Fit the model with X.

Samples random projection according to n_features.

Parameters ---------- X : array-like, shape (n_samples, n_features) Training data, where n_samples in the number of samples and n_features is the number of features.

Returns ------- self : object Returns the transformer.

Sourceval fit_transform : ?y:[> `ArrayLike ] Np.Obj.t -> ?fit_params:(string * Py.Object.t) list -> x:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> [> `ArrayLike ] Np.Obj.t

Fit to data, then transform it.

Fits transformer to X and y with optional parameters fit_params and returns a transformed version of X.

Parameters ---------- X : array-like, sparse matrix, dataframe of shape (n_samples, n_features)

y : ndarray of shape (n_samples,), default=None Target values.

**fit_params : dict Additional fit parameters.

Returns ------- X_new : ndarray array of shape (n_samples, n_features_new) Transformed array.

Sourceval get_params : ?deep:bool -> [> tag ] Obj.t -> Dict.t

Get parameters for this estimator.

Parameters ---------- deep : bool, default=True 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.

Sourceval set_params : ?params:(string * Py.Object.t) list -> [> tag ] Obj.t -> t

Set the parameters of this estimator.

The method works on simple estimators as well as on nested objects (such as pipelines). The latter have parameters of the form ``<component>__<parameter>`` so that it's possible to update each component of a nested object.

Parameters ---------- **params : dict Estimator parameters.

Returns ------- self : object Estimator instance.

Sourceval transform : x:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> [> `ArrayLike ] Np.Obj.t

Apply the approximate feature map to X.

Parameters ---------- X : array-like, shape (n_samples, n_features) New data, where n_samples in the number of samples and n_features is the number of features. All values of X must be strictly greater than '-skewedness'.

Returns ------- X_new : array-like, shape (n_samples, n_components)

Sourceval to_string : t -> string

Print the object to a human-readable representation.

Sourceval show : t -> string

Print the object to a human-readable representation.

Sourceval pp : Format.formatter -> t -> unit

Pretty-print the object to a formatter.