package sklearn

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type tag = [
  1. | `LarsCV
]
type t = [ `BaseEstimator | `LarsCV | `MultiOutputMixin | `Object | `RegressorMixin ] Obj.t
val of_pyobject : Py.Object.t -> t
val to_pyobject : [> tag ] Obj.t -> Py.Object.t
val as_estimator : t -> [ `BaseEstimator ] Obj.t
val as_regressor : t -> [ `RegressorMixin ] Obj.t
val as_multi_output : t -> [ `MultiOutputMixin ] Obj.t
val create : ?fit_intercept:bool -> ?verbose:int -> ?max_iter:int -> ?normalize:bool -> ?precompute:[ `Arr of [> `ArrayLike ] Np.Obj.t | `Auto | `Bool of bool ] -> ?cv: [ `BaseCrossValidator of [> `BaseCrossValidator ] Np.Obj.t | `Arr of [> `ArrayLike ] Np.Obj.t | `I of int ] -> ?max_n_alphas:int -> ?n_jobs:int -> ?eps:float -> ?copy_X:bool -> unit -> t

Cross-validated Least Angle Regression model.

See glossary entry for :term:`cross-validation estimator`.

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

Parameters ---------- fit_intercept : bool, default=True whether to calculate the intercept for this model. If set to false, no intercept will be used in calculations (i.e. data is expected to be centered).

verbose : bool or int, default=False Sets the verbosity amount

max_iter : int, default=500 Maximum number of iterations to perform.

normalize : bool, default=True This parameter is ignored when ``fit_intercept`` is set to False. If True, the regressors X will be normalized before regression by subtracting the mean and dividing by the l2-norm. If you wish to standardize, please use :class:`sklearn.preprocessing.StandardScaler` before calling ``fit`` on an estimator with ``normalize=False``.

precompute : bool, 'auto' or array-like , default='auto' Whether to use a precomputed Gram matrix to speed up calculations. If set to ``'auto'`` let us decide. The Gram matrix cannot be passed as argument since we will use only subsets of X.

cv : int, cross-validation generator or an iterable, default=None Determines the cross-validation splitting strategy. Possible inputs for cv are:

  • None, to use the default 5-fold cross-validation,
  • integer, to specify the number of folds.
  • :term:`CV splitter`,
  • An iterable yielding (train, test) splits as arrays of indices.

For integer/None inputs, :class:`KFold` is used.

Refer :ref:`User Guide <cross_validation>` for the various cross-validation strategies that can be used here.

.. versionchanged:: 0.22 ``cv`` default value if None changed from 3-fold to 5-fold.

max_n_alphas : int, default=1000 The maximum number of points on the path used to compute the residuals in the cross-validation

n_jobs : int or None, default=None Number of CPUs to use during the cross validation. ``None`` means 1 unless in a :obj:`joblib.parallel_backend` context. ``-1`` means using all processors. See :term:`Glossary <n_jobs>` for more details.

eps : float, optional The machine-precision regularization in the computation of the Cholesky diagonal factors. Increase this for very ill-conditioned systems. By default, ``np.finfo(np.float).eps`` is used.

copy_X : bool, default=True If ``True``, X will be copied; else, it may be overwritten.

Attributes ---------- coef_ : array-like of shape (n_features,) parameter vector (w in the formulation formula)

intercept_ : float independent term in decision function

coef_path_ : array-like of shape (n_features, n_alphas) the varying values of the coefficients along the path

alpha_ : float the estimated regularization parameter alpha

alphas_ : array-like of shape (n_alphas,) the different values of alpha along the path

cv_alphas_ : array-like of shape (n_cv_alphas,) all the values of alpha along the path for the different folds

mse_path_ : array-like of shape (n_folds, n_cv_alphas) the mean square error on left-out for each fold along the path (alpha values given by ``cv_alphas``)

n_iter_ : array-like or int the number of iterations run by Lars with the optimal alpha.

Examples -------- >>> from sklearn.linear_model import LarsCV >>> from sklearn.datasets import make_regression >>> X, y = make_regression(n_samples=200, noise=4.0, random_state=0) >>> reg = LarsCV(cv=5).fit(X, y) >>> reg.score(X, y) 0.9996... >>> reg.alpha_ 0.0254... >>> reg.predict(X:1,) array(154.0842...)

See also -------- lars_path, LassoLars, LassoLarsCV

val fit : x:[> `ArrayLike ] Np.Obj.t -> y:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> t

Fit the model using X, y as training data.

Parameters ---------- X : array-like of shape (n_samples, n_features) Training data.

y : array-like of shape (n_samples,) Target values.

Returns ------- self : object returns an instance of self.

val 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.

val predict : x:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> [> `ArrayLike ] Np.Obj.t

Predict using the linear model.

Parameters ---------- X : array_like or sparse matrix, shape (n_samples, n_features) Samples.

Returns ------- C : array, shape (n_samples,) Returns predicted values.

val score : ?sample_weight:[> `ArrayLike ] Np.Obj.t -> x:[> `ArrayLike ] Np.Obj.t -> y:[> `ArrayLike ] Np.Obj.t -> [> tag ] Obj.t -> float

Return the coefficient of determination R^2 of the prediction.

The coefficient R^2 is defined as (1 - u/v), where u is the residual sum of squares ((y_true - y_pred) ** 2).sum() and v is the total sum of squares ((y_true - y_true.mean()) ** 2).sum(). The best possible score is 1.0 and it can be negative (because the model can be arbitrarily worse). A constant model that always predicts the expected value of y, disregarding the input features, would get a R^2 score of 0.0.

Parameters ---------- X : array-like of shape (n_samples, n_features) Test samples. For some estimators this may be a precomputed kernel matrix or a list of generic objects instead, shape = (n_samples, n_samples_fitted), where n_samples_fitted is the number of samples used in the fitting for the estimator.

y : array-like of shape (n_samples,) or (n_samples, n_outputs) True values for X.

sample_weight : array-like of shape (n_samples,), default=None Sample weights.

Returns ------- score : float R^2 of self.predict(X) wrt. y.

Notes ----- The R2 score used when calling ``score`` on a regressor uses ``multioutput='uniform_average'`` from version 0.23 to keep consistent with default value of :func:`~sklearn.metrics.r2_score`. This influences the ``score`` method of all the multioutput regressors (except for :class:`~sklearn.multioutput.MultiOutputRegressor`).

val 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.

val coef_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute coef_: get value or raise Not_found if None.

val coef_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute coef_: get value as an option.

val intercept_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute intercept_: get value or raise Not_found if None.

val intercept_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute intercept_: get value as an option.

val coef_path_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute coef_path_: get value or raise Not_found if None.

val coef_path_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute coef_path_: get value as an option.

val alpha_ : t -> float

Attribute alpha_: get value or raise Not_found if None.

val alpha_opt : t -> float option

Attribute alpha_: get value as an option.

val alphas_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute alphas_: get value or raise Not_found if None.

val alphas_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute alphas_: get value as an option.

val cv_alphas_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute cv_alphas_: get value or raise Not_found if None.

val cv_alphas_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute cv_alphas_: get value as an option.

val mse_path_ : t -> [> `ArrayLike ] Np.Obj.t

Attribute mse_path_: get value or raise Not_found if None.

val mse_path_opt : t -> [> `ArrayLike ] Np.Obj.t option

Attribute mse_path_: get value as an option.

val n_iter_ : t -> Py.Object.t

Attribute n_iter_: get value or raise Not_found if None.

val n_iter_opt : t -> Py.Object.t option

Attribute n_iter_: get value as an option.

val to_string : t -> string

Print the object to a human-readable representation.

val show : t -> string

Print the object to a human-readable representation.

val pp : Stdlib.Format.formatter -> t -> unit

Pretty-print the object to a formatter.