NearestNeighbors
Unsupervised learner for implementing neighbor searches.
Read more in the User Guide.
Python Reference (opens in a new tab)
Constructors
constructor()
Signature
new NearestNeighbors(opts?: object): NearestNeighbors;Parameters
| Name | Type | Description |
|---|---|---|
opts? | object | - |
opts.algorithm? | "auto" | "ball_tree" | "kd_tree" | "brute" | Algorithm used to compute the nearest neighbors: Default Value 'auto' |
opts.leaf_size? | number | Leaf size passed to BallTree or KDTree. This can affect the speed of the construction and query, as well as the memory required to store the tree. The optimal value depends on the nature of the problem. Default Value 30 |
opts.metric? | string | Metric to use for distance computation. Default is “minkowski”, which results in the standard Euclidean distance when p = 2. See the documentation of scipy.spatial.distance (opens in a new tab) and the metrics listed in distance\_metrics for valid metric values. If metric is “precomputed”, X is assumed to be a distance matrix and must be square during fit. X may be a sparse graph, in which case only “nonzero” elements may be considered neighbors. If metric is a callable function, it takes two arrays representing 1D vectors as inputs and must return one value indicating the distance between those vectors. This works for Scipy’s metrics, but is less efficient than passing the metric name as a string. Default Value 'minkowski' |
opts.metric_params? | any | Additional keyword arguments for the metric function. |
opts.n_jobs? | number | The number of parallel jobs to run for neighbors search. undefined means 1 unless in a joblib.parallel\_backend (opens in a new tab) context. \-1 means using all processors. See Glossary for more details. |
opts.n_neighbors? | number | Number of neighbors to use by default for kneighbors queries. Default Value 5 |
opts.p? | number | Parameter for the Minkowski metric from sklearn.metrics.pairwise.pairwise_distances. 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. Default Value 2 |
opts.radius? | number | Range of parameter space to use by default for radius\_neighbors queries. Default Value 1 |
Returns
Defined in: generated/neighbors/NearestNeighbors.ts:23 (opens in a new tab)
Properties
_isDisposed
boolean=false
Defined in: generated/neighbors/NearestNeighbors.ts:21 (opens in a new tab)
_isInitialized
boolean=false
Defined in: generated/neighbors/NearestNeighbors.ts:20 (opens in a new tab)
_py
PythonBridge
Defined in: generated/neighbors/NearestNeighbors.ts:19 (opens in a new tab)
id
string
Defined in: generated/neighbors/NearestNeighbors.ts:16 (opens in a new tab)
opts
any
Defined in: generated/neighbors/NearestNeighbors.ts:17 (opens in a new tab)
Accessors
effective_metric_
Metric used to compute distances to neighbors.
Signature
effective_metric_(): Promise<string>;Returns
Promise<string>
Defined in: generated/neighbors/NearestNeighbors.ts:429 (opens in a new tab)
effective_metric_params_
Parameters for the metric used to compute distances to neighbors.
Signature
effective_metric_params_(): Promise<any>;Returns
Promise<any>
Defined in: generated/neighbors/NearestNeighbors.ts:456 (opens in a new tab)
feature_names_in_
Names of features seen during fit. Defined only when X has feature names that are all strings.
Signature
feature_names_in_(): Promise<ArrayLike>;Returns
Promise<ArrayLike>
Defined in: generated/neighbors/NearestNeighbors.ts:510 (opens in a new tab)
n_features_in_
Number of features seen during fit.
Signature
n_features_in_(): Promise<number>;Returns
Promise<number>
Defined in: generated/neighbors/NearestNeighbors.ts:483 (opens in a new tab)
n_samples_fit_
Number of samples in the fitted data.
Signature
n_samples_fit_(): Promise<number>;Returns
Promise<number>
Defined in: generated/neighbors/NearestNeighbors.ts:537 (opens in a new tab)
py
Signature
py(): PythonBridge;Returns
PythonBridge
Defined in: generated/neighbors/NearestNeighbors.ts:84 (opens in a new tab)
Signature
py(pythonBridge: PythonBridge): void;Parameters
| Name | Type |
|---|---|
pythonBridge | PythonBridge |
Returns
void
Defined in: generated/neighbors/NearestNeighbors.ts:88 (opens in a new tab)
Methods
dispose()
Disposes of the underlying Python resources.
Once dispose() is called, the instance is no longer usable.
Signature
dispose(): Promise<void>;Returns
Promise<void>
Defined in: generated/neighbors/NearestNeighbors.ts:145 (opens in a new tab)
fit()
Fit the nearest neighbors estimator from the training dataset.
Signature
fit(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | Training data. |
opts.y? | any | Not used, present for API consistency by convention. |
Returns
Promise<any>
Defined in: generated/neighbors/NearestNeighbors.ts:162 (opens in a new tab)
init()
Initializes the underlying Python resources.
This instance is not usable until the Promise returned by init() resolves.
Signature
init(py: PythonBridge): Promise<void>;Parameters
| Name | Type |
|---|---|
py | PythonBridge |
Returns
Promise<void>
Defined in: generated/neighbors/NearestNeighbors.ts:97 (opens in a new tab)
kneighbors()
Find the K-neighbors of a point.
Returns indices of and distances to the neighbors of each point.
Signature
kneighbors(opts: object): Promise<ArrayLike[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | any | The query point or points. If not provided, neighbors of each indexed point are returned. In this case, the query point is not considered its own neighbor. |
opts.n_neighbors? | number | Number of neighbors required for each sample. The default is the value passed to the constructor. |
opts.return_distance? | boolean | Whether or not to return the distances. Default Value true |
Returns
Promise<ArrayLike[]>
Defined in: generated/neighbors/NearestNeighbors.ts:204 (opens in a new tab)
kneighbors_graph()
Compute the (weighted) graph of k-Neighbors for points in X.
Signature
kneighbors_graph(opts: object): Promise<any[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | any | The query point or points. If not provided, neighbors of each indexed point are returned. In this case, the query point is not considered its own neighbor. For metric='precomputed' the shape should be (n_queries, n_indexed). Otherwise the shape should be (n_queries, n_features). |
opts.mode? | "connectivity" | "distance" | Type of returned matrix: ‘connectivity’ will return the connectivity matrix with ones and zeros, in ‘distance’ the edges are distances between points, type of distance depends on the selected metric parameter in NearestNeighbors class. Default Value 'connectivity' |
opts.n_neighbors? | number | Number of neighbors for each sample. The default is the value passed to the constructor. |
Returns
Promise<any[]>
Defined in: generated/neighbors/NearestNeighbors.ts:253 (opens in a new tab)
radius_neighbors()
Find the neighbors within a given radius of a point or points.
Return the indices and distances of each point from the dataset lying in a ball with size radius around the points of the query array. Points lying on the boundary are included in the results.
The result points are not necessarily sorted by distance to their query point.
Signature
radius_neighbors(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | any | The query point or points. If not provided, neighbors of each indexed point are returned. In this case, the query point is not considered its own neighbor. |
opts.radius? | number | Limiting distance of neighbors to return. The default is the value passed to the constructor. |
opts.return_distance? | boolean | Whether or not to return the distances. Default Value true |
opts.sort_results? | boolean | If true, the distances and indices will be sorted by increasing distances before being returned. If false, the results may not be sorted. If return\_distance=False, setting sort\_results=True will result in an error. Default Value false |
Returns
Promise<any>
Defined in: generated/neighbors/NearestNeighbors.ts:308 (opens in a new tab)
radius_neighbors_graph()
Compute the (weighted) graph of Neighbors for points in X.
Neighborhoods are restricted the points at a distance lower than radius.
Signature
radius_neighbors_graph(opts: object): Promise<any[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | The query point or points. If not provided, neighbors of each indexed point are returned. In this case, the query point is not considered its own neighbor. |
opts.mode? | "connectivity" | "distance" | Type of returned matrix: ‘connectivity’ will return the connectivity matrix with ones and zeros, in ‘distance’ the edges are distances between points, type of distance depends on the selected metric parameter in NearestNeighbors class. Default Value 'connectivity' |
opts.radius? | number | Radius of neighborhoods. The default is the value passed to the constructor. |
opts.sort_results? | boolean | If true, in each row of the result, the non-zero entries will be sorted by increasing distances. If false, the non-zero entries may not be sorted. Only used with mode=’distance’. Default Value false |
Returns
Promise<any[]>
Defined in: generated/neighbors/NearestNeighbors.ts:368 (opens in a new tab)