8.5.6. sklearn.decomposition.FastICA

class sklearn.decomposition.FastICA(n_components=None, algorithm='parallel', whiten=True, fun='logcosh', fun_prime='', fun_args=None, max_iter=200, tol=0.0001, w_init=None, random_state=None)

FastICA; a fast algorithm for Independent Component Analysis

Parameters :

n_components : int, optional

Number of components to use. If none is passed, all are used.

algorithm : {‘parallel’, ‘deflation’}

Apply parallel or deflational algorithm for FastICA

whiten : boolean, optional

If whiten is false, the data is already considered to be whitened, and no whitening is performed.

fun : {‘logcosh’, ‘exp’, or ‘cube’}, or a callable

The non-linear function used in the FastICA loop to approximate negentropy. If a function is passed, it derivative should be passed as the ‘fun_prime’ argument.

fun_prime : None or a callable

The derivative of the non-linearity used.

max_iter : int, optional

Maximum number of iterations during fit

tol : float, optional

Tolerance on update at each iteration

w_init : None of an (n_components, n_components) ndarray

The mixing matrix to be used to initialize the algorithm.

random_state: int or RandomState :

Pseudo number generator state used for random sampling.

Notes

Implementation based on A. Hyvarinen and E. Oja, Independent Component Analysis: Algorithms and Applications, Neural Networks, 13(4-5), 2000, pp. 411-430

Attributes

unmixing_matrix_

2D array, [n_components, n_samples]

The unmixing matrix

Methods

fit(X)
get_mixing_matrix()	Compute the mixing matrix
get_params([deep])	Get parameters for the estimator
set_params(**params)	Set the parameters of the estimator.
transform(X)	Apply un-mixing matrix “W” to X to recover the sources

__init__(n_components=None, algorithm='parallel', whiten=True, fun='logcosh', fun_prime='', fun_args=None, max_iter=200, tol=0.0001, w_init=None, random_state=None)

get_mixing_matrix()

Compute the mixing matrix

get_params(deep=True)

Get parameters for the estimator

Parameters :

deep: boolean, optional :

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

set_params(**params)

Set the parameters of the estimator.

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

Returns :self :

transform(X)

Apply un-mixing matrix “W” to X to recover the sources

S = X * W.T