# `sklearn.neighbors`.radius_neighbors_graph¶

`sklearn.neighbors.``radius_neighbors_graph`(X, radius, mode='connectivity', metric='minkowski', p=2, metric_params=None, include_self=None)[源代码]

Computes the (weighted) graph of Neighbors for points in X

Neighborhoods are restricted the points at a distance lower than radius.

Read more in the User Guide.

Parameters: X : array-like or BallTree, shape = [n_samples, n_features] Sample data, in the form of a numpy array or a precomputed `BallTree`. radius : float Radius of neighborhoods. mode : {‘connectivity’, ‘distance’}, optional Type of returned matrix: ‘connectivity’ will return the connectivity matrix with ones and zeros, in ‘distance’ the edges are Euclidean distance between points. metric : string, default ‘minkowski’ The distance metric used to calculate the neighbors within a given radius for each sample point. The DistanceMetric class gives a list of available metrics. The default distance is ‘euclidean’ (‘minkowski’ metric with the param equal to 2.) include_self: bool, default None : Whether or not to mark each sample as the first nearest neighbor to itself. If None, then True is used for mode=’connectivity’ and False for mode=’distance’ as this will preserve backwards compatibilty. From version 0.18, the default value will be False, irrespective of the value of mode. p : int, default 2 Power parameter for the Minkowski metric. When p = 1, this is equivalent to using manhattan_distance (l1), and euclidean_distance (l2) for p = 2. For arbitrary p, minkowski_distance (l_p) is used. metric_params: dict, optional : additional keyword arguments for the metric function. A : sparse matrix in CSR format, shape = [n_samples, n_samples] A[i, j] is assigned the weight of edge that connects i to j.

Examples

```>>> X = [[0], [3], [1]]