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sklearn.utils.extmath.safe_sparse_dot

sklearn.utils.extmath.safe_sparse_dot(a, b, dense_output=False) [source]

Dot product that handle the sparse matrix case correctly

Uses BLAS GEMM as replacement for numpy.dot where possible to avoid unnecessary copies.

Parameters:
a : array or sparse matrix
b : array or sparse matrix
dense_output : boolean, default False

When False, either a or b being sparse will yield sparse output. When True, output will always be an array.

Returns:
dot_product : array or sparse matrix

sparse if a or b is sparse and dense_output=False.

© 2007–2018 The scikit-learn developers
Licensed under the 3-clause BSD License.
http://scikit-learn.org/stable/modules/generated/sklearn.utils.extmath.safe_sparse_dot.html