skglm.ElasticNet

class skglm.ElasticNet(alpha=1.0, l1_ratio=0.5, max_iter=50, max_epochs=50000, p0=10, verbose=0, tol=0.0001, positive=False, fit_intercept=True, warm_start=False, ws_strategy='subdiff')

Elastic net estimator.

The optimization objective for Elastic net is:

`1 / (2 xx n_"samples") ||y - Xw||_2 ^ 2 + tt"l1_ratio" xx alpha ||w||_1 + (1 - tt"l1_ratio") xx alpha/2 ||w||_2 ^ 2`

Parameters:

alphafloat, optional

Penalty strength.

l1_ratiofloat, default=0.5

The ElasticNet mixing parameter, with 0 <= l1_ratio <= 1. For l1_ratio = 0 the penalty is an L2 penalty. For l1_ratio = 1 it is an L1 penalty. For 0 < l1_ratio < 1, the penalty is a combination of L1 and L2.

max_iterint, optional

The maximum number of iterations (subproblem definitions).

max_epochsint

Maximum number of CD epochs on each subproblem.

p0int

First working set size.

verbosebool or int

Amount of verbosity.

tolfloat, optional

Stopping criterion for the optimization.

positivebool, optional

When set to True, forces the coefficient vector to be positive.

fit_interceptbool, optional (default=True)

Whether or not to fit an intercept.

warm_startbool, optional (default=False)

When set to True, reuse the solution of the previous call to fit as initialization, otherwise, just erase the previous solution.

ws_strategystr

The score used to build the working set. Can be fixpoint or subdiff.

Attributes:

coef_array, shape (n_features,)

parameter vector (`w` in the cost function formula)

sparse_coef_scipy.sparse matrix, shape (n_features, 1)

sparse_coef_ is a readonly property derived from coef_

intercept_float

constant term in decision function.

n_iter_int

Number of subproblems solved to reach the specified tolerance.

See also

Lasso

Lasso regularization.

__init__(alpha=1.0, l1_ratio=0.5, max_iter=50, max_epochs=50000, p0=10, verbose=0, tol=0.0001, positive=False, fit_intercept=True, warm_start=False, ws_strategy='subdiff')

Methods

__init__([alpha, l1_ratio, max_iter, ...])
fit(X, y)	Fit the model according to the given training data.
get_metadata_routing()	Get metadata routing of this object.
get_params([deep])	Get parameters for this estimator.
path(X, y, alphas[, coef_init, return_n_iter])	Compute Elastic Net path.
predict(X)	Predict using the linear model.
score(X, y[, sample_weight])	Return coefficient of determination on test data.
set_params(**params)	Set the parameters of this estimator.
set_score_request(*[, sample_weight])	Configure whether metadata should be requested to be passed to the score method.