sklearn.cross_decomposition.PLSSVD

class sklearn.cross_decomposition.PLSSVD(n_components=2, *, scale=True, copy=True)

Partial Least Square SVD.

This transformer simply performs a SVD on the cross-covariance matrix X'Y. It is able to project both the training data X and the targets Y. The training data X is projected on the left singular vectors, while the targets are projected on the right singular vectors.

Read more in the User Guide.

New in version 0.8.

Parameters:

n_componentsint, default=2

The number of components to keep. Should be in [1, min(n_samples, n_features, n_targets)].

scalebool, default=True

Whether to scale X and Y.

copybool, default=True

Whether to copy X and Y in fit before applying centering, and potentially scaling. If False, these operations will be done inplace, modifying both arrays.

Attributes:

x_weights_ndarray of shape (n_features, n_components)

The left singular vectors of the SVD of the cross-covariance matrix. Used to project X in transform.

y_weights_ndarray of (n_targets, n_components)

The right singular vectors of the SVD of the cross-covariance matrix. Used to project X in transform.

n_features_in_int

Number of features seen during fit.

feature_names_in_ndarray of shape (n_features_in_,)

Names of features seen during fit. Defined only when X has feature names that are all strings.

New in version 1.0.

See also

PLSCanonical

Partial Least Squares transformer and regressor.

CCA

Canonical Correlation Analysis.

Examples

>>> import numpy as np
>>> from sklearn.cross_decomposition import PLSSVD
>>> X = np.array([[0., 0., 1.],
...               [1., 0., 0.],
...               [2., 2., 2.],
...               [2., 5., 4.]])
>>> Y = np.array([[0.1, -0.2],
...               [0.9, 1.1],
...               [6.2, 5.9],
...               [11.9, 12.3]])
>>> pls = PLSSVD(n_components=2).fit(X, Y)
>>> X_c, Y_c = pls.transform(X, Y)
>>> X_c.shape, Y_c.shape
((4, 2), (4, 2))

Methods

fit(X, Y)	Fit model to data.
fit_transform(X[, y])	Learn and apply the dimensionality reduction.
get_feature_names_out([input_features])	Get output feature names for transformation.
get_metadata_routing()	Get metadata routing of this object.
get_params([deep])	Get parameters for this estimator.
set_output(*[, transform])	Set output container.
set_params(**params)	Set the parameters of this estimator.
transform(X[, Y])	Apply the dimensionality reduction.

fit(X, Y)

Fit model to data.

Parameters:

Xarray-like of shape (n_samples, n_features)

Training samples.

Yarray-like of shape (n_samples,) or (n_samples, n_targets)

Targets.

Returns:

selfobject

Fitted estimator.

fit_transform(X, y=None)

Learn and apply the dimensionality reduction.

Parameters:

Xarray-like of shape (n_samples, n_features)

Training samples.

yarray-like of shape (n_samples,) or (n_samples, n_targets), default=None

Targets.

Returns:

outarray-like or tuple of array-like

The transformed data X_transformed if Y is not None, (X_transformed, Y_transformed) otherwise.

get_feature_names_out(input_features=None)

Get output feature names for transformation.

The feature names out will prefixed by the lowercased class name. For example, if the transformer outputs 3 features, then the feature names out are: ["class_name0", "class_name1", "class_name2"].

Parameters:

input_featuresarray-like of str or None, default=None

Only used to validate feature names with the names seen in fit.

Returns:

feature_names_outndarray of str objects

Transformed feature names.

get_metadata_routing()

Get metadata routing of this object.

Please check User Guide on how the routing mechanism works.

Returns:

routingMetadataRequest

A MetadataRequest encapsulating routing information.

get_params(deep=True)

Get parameters for this estimator.

Parameters:

deepbool, default=True

If True, will return the parameters for this estimator and contained subobjects that are estimators.

Returns:

paramsdict

Parameter names mapped to their values.

set_output(*, transform=None)

Set output container.

See Introducing the set_output API for an example on how to use the API.

Parameters:

transform{“default”, “pandas”}, default=None

Configure output of transform and fit_transform.

• "default": Default output format of a transformer

• "pandas": DataFrame output

• "polars": Polars output

• None: Transform configuration is unchanged

New in version 1.4: "polars" option was added.

Returns:

selfestimator instance

Estimator instance.

set_params(**params)

Set the parameters of this estimator.

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

Parameters:

**paramsdict

Estimator parameters.

Returns:

selfestimator instance

Estimator instance.

transform(X, Y=None)

Apply the dimensionality reduction.

Parameters:

Xarray-like of shape (n_samples, n_features)

Samples to be transformed.

Yarray-like of shape (n_samples,) or (n_samples, n_targets), default=None

Targets.

Returns:

x_scoresarray-like or tuple of array-like

The transformed data X_transformed if Y is not None, (X_transformed, Y_transformed) otherwise.