sklearn.metrics.pairwise.manhattan_distances()

sklearn.metrics.pairwise.manhattan_distances(X, Y=None, sum_over_features=True, size_threshold=500000000.0) [source]

Compute the L1 distances between the vectors in X and Y.

With sum_over_features equal to False it returns the componentwise distances.

Parameters:	X : array_like An array with shape (n_samples_X, n_features). Y : array_like, optional An array with shape (n_samples_Y, n_features). sum_over_features : bool, default=True If True the function returns the pairwise distance matrix else it returns the componentwise L1 pairwise-distances. Not supported for sparse matrix inputs. size_threshold : int, default=5e8 Unused parameter.
Returns:	D : array If sum_over_features is False shape is (n_samples_X * n_samples_Y, n_features) and D contains the componentwise L1 pairwise-distances (ie. absolute difference), else shape is (n_samples_X, n_samples_Y) and D contains the pairwise L1 distances.

Examples

>>> from sklearn.metrics.pairwise import manhattan_distances
>>> manhattan_distances([[3]], [[3]])
array([[ 0.]])
>>> manhattan_distances([[3]], [[2]])
array([[ 1.]])
>>> manhattan_distances([[2]], [[3]])
array([[ 1.]])
>>> manhattan_distances([[1, 2], [3, 4]],         [[1, 2], [0, 3]])
array([[ 0.,  2.],
       [ 4.,  4.]])
>>> import numpy as np
>>> X = np.ones((1, 2))
>>> y = 2 * np.ones((2, 2))
>>> manhattan_distances(X, y, sum_over_features=False)
array([[ 1.,  1.],
       [ 1.,  1.]]...)

Links:

http://scikit-learn.org/stable/modules/generated/sklearn.metrics.pairwise.manhattan_distances.html

doc_scikit_learn

2017-01-15 04:26:33

Comments