sklearn.preprocessing.normalize¶

sklearn.preprocessing.normalize(X, norm='l2', *, axis=1, copy=True, return_norm=False)[source]¶

Scale input vectors individually to unit norm (vector length).

Read more in the User Guide.

Parameters

X{array-like, sparse matrix} of shape (n_samples, n_features)

The data to normalize, element by element. scipy.sparse matrices should be in CSR format to avoid an un-necessary copy.

norm{‘l1’, ‘l2’, ‘max’}, default=’l2’

The norm to use to normalize each non zero sample (or each non-zero feature if axis is 0).

axis{0, 1}, default=1

axis used to normalize the data along. If 1, independently normalize each sample, otherwise (if 0) normalize each feature.

copybool, default=True

set to False to perform inplace row normalization and avoid a copy (if the input is already a numpy array or a scipy.sparse CSR matrix and if axis is 1).

return_normbool, default=False

whether to return the computed norms

Returns

X{ndarray, sparse matrix} of shape (n_samples, n_features)

Normalized input X.

normsndarray of shape (n_samples, ) if axis=1 else (n_features, )

An array of norms along given axis for X. When X is sparse, a NotImplementedError will be raised for norm ‘l1’ or ‘l2’.

See also

Normalizer

Performs normalization using the Transformer API (e.g. as part of a preprocessing Pipeline).

Notes

For a comparison of the different scalers, transformers, and normalizers, see examples/preprocessing/plot_all_scaling.py.