KMeans
K-Means clustering.
Read more in the User Guide.
Python Reference (opens in a new tab)
Constructors
constructor()
Signature
new KMeans(opts?: object): KMeans;Parameters
| Name | Type | Description |
|---|---|---|
opts? | object | - |
opts.algorithm? | "auto" | "lloyd" | "elkan" | "full" | K-means algorithm to use. The classical EM-style algorithm is "lloyd". The "elkan" variation can be more efficient on some datasets with well-defined clusters, by using the triangle inequality. However it’s more memory intensive due to the allocation of an extra array of shape (n\_samples, n\_clusters). "auto" and "full" are deprecated and they will be removed in Scikit-Learn 1.3. They are both aliases for "lloyd". Default Value 'lloyd' |
opts.copy_x? | boolean | When pre-computing distances it is more numerically accurate to center the data first. If copy_x is true (default), then the original data is not modified. If false, the original data is modified, and put back before the function returns, but small numerical differences may be introduced by subtracting and then adding the data mean. Note that if the original data is not C-contiguous, a copy will be made even if copy_x is false. If the original data is sparse, but not in CSR format, a copy will be made even if copy_x is false. Default Value true |
opts.init? | ArrayLike[] | "k-means++" | "random" | Method for initialization: ‘k-means++’ : selects initial cluster centroids using sampling based on an empirical probability distribution of the points’ contribution to the overall inertia. This technique speeds up convergence. The algorithm implemented is “greedy k-means++”. It differs from the vanilla k-means++ by making several trials at each sampling step and choosing the best centroid among them. ‘random’: choose n\_clusters observations (rows) at random from data for the initial centroids. If an array is passed, it should be of shape (n_clusters, n_features) and gives the initial centers. If a callable is passed, it should take arguments X, n_clusters and a random state and return an initialization. Default Value 'k-means++' |
opts.max_iter? | number | Maximum number of iterations of the k-means algorithm for a single run. Default Value 300 |
opts.n_clusters? | number | The number of clusters to form as well as the number of centroids to generate. Default Value 8 |
opts.n_init? | number | "auto" | Number of times the k-means algorithm is run with different centroid seeds. The final results is the best output of n\_init consecutive runs in terms of inertia. Several runs are recommended for sparse high-dimensional problems (see Clustering sparse data with k-means). When n\_init='auto', the number of runs depends on the value of init: 10 if using init='random', 1 if using init='k-means++'. Default Value 10 |
opts.random_state? | number | Determines random number generation for centroid initialization. Use an int to make the randomness deterministic. See Glossary. |
opts.tol? | number | Relative tolerance with regards to Frobenius norm of the difference in the cluster centers of two consecutive iterations to declare convergence. Default Value 0.0001 |
opts.verbose? | number | Verbosity mode. Default Value 0 |
Returns
Defined in: generated/cluster/KMeans.ts:23 (opens in a new tab)
Properties
_isDisposed
boolean=false
Defined in: generated/cluster/KMeans.ts:21 (opens in a new tab)
_isInitialized
boolean=false
Defined in: generated/cluster/KMeans.ts:20 (opens in a new tab)
_py
PythonBridge
Defined in: generated/cluster/KMeans.ts:19 (opens in a new tab)
id
string
Defined in: generated/cluster/KMeans.ts:16 (opens in a new tab)
opts
any
Defined in: generated/cluster/KMeans.ts:17 (opens in a new tab)
Accessors
cluster_centers_
Coordinates of cluster centers. If the algorithm stops before fully converging (see tol and max\_iter), these will not be consistent with labels\_.
Signature
cluster_centers_(): Promise<ArrayLike[]>;Returns
Promise<ArrayLike[]>
Defined in: generated/cluster/KMeans.ts:517 (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/cluster/KMeans.ts:632 (opens in a new tab)
inertia_
Sum of squared distances of samples to their closest cluster center, weighted by the sample weights if provided.
Signature
inertia_(): Promise<number>;Returns
Promise<number>
Defined in: generated/cluster/KMeans.ts:564 (opens in a new tab)
labels_
Labels of each point
Signature
labels_(): Promise<ArrayLike>;Returns
Promise<ArrayLike>
Defined in: generated/cluster/KMeans.ts:542 (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/cluster/KMeans.ts:609 (opens in a new tab)
n_iter_
Number of iterations run.
Signature
n_iter_(): Promise<number>;Returns
Promise<number>
Defined in: generated/cluster/KMeans.ts:587 (opens in a new tab)
py
Signature
py(): PythonBridge;Returns
PythonBridge
Defined in: generated/cluster/KMeans.ts:101 (opens in a new tab)
Signature
py(pythonBridge: PythonBridge): void;Parameters
| Name | Type |
|---|---|
pythonBridge | PythonBridge |
Returns
void
Defined in: generated/cluster/KMeans.ts:105 (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/cluster/KMeans.ts:161 (opens in a new tab)
fit()
Compute k-means clustering.
Signature
fit(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | Training instances to cluster. It must be noted that the data will be converted to C ordering, which will cause a memory copy if the given data is not C-contiguous. If a sparse matrix is passed, a copy will be made if it’s not in CSR format. |
opts.sample_weight? | ArrayLike | The weights for each observation in X. If undefined, all observations are assigned equal weight. |
opts.y? | any | Not used, present here for API consistency by convention. |
Returns
Promise<any>
Defined in: generated/cluster/KMeans.ts:178 (opens in a new tab)
fit_predict()
Compute cluster centers and predict cluster index for each sample.
Convenience method; equivalent to calling fit(X) followed by predict(X).
Signature
fit_predict(opts: object): Promise<ArrayLike>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | New data to transform. |
opts.sample_weight? | ArrayLike | The weights for each observation in X. If undefined, all observations are assigned equal weight. |
opts.y? | any | Not used, present here for API consistency by convention. |
Returns
Promise<ArrayLike>
Defined in: generated/cluster/KMeans.ts:227 (opens in a new tab)
fit_transform()
Compute clustering and transform X to cluster-distance space.
Equivalent to fit(X).transform(X), but more efficiently implemented.
Signature
fit_transform(opts: object): Promise<ArrayLike[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | New data to transform. |
opts.sample_weight? | ArrayLike | The weights for each observation in X. If undefined, all observations are assigned equal weight. |
opts.y? | any | Not used, present here for API consistency by convention. |
Returns
Promise<ArrayLike[]>
Defined in: generated/cluster/KMeans.ts:276 (opens in a new tab)
get_feature_names_out()
Get output feature names for transformation.
The feature names out will prefixed by the lowercased class name. For example, if the transformer outputs 3 features, then the feature names out are: \["class\_name0", "class\_name1", "class\_name2"\].
Signature
get_feature_names_out(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.input_features? | any | Only used to validate feature names with the names seen in fit. |
Returns
Promise<any>
Defined in: generated/cluster/KMeans.ts:325 (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/cluster/KMeans.ts:114 (opens in a new tab)
predict()
Predict the closest cluster each sample in X belongs to.
In the vector quantization literature, cluster\_centers\_ is called the code book and each value returned by predict is the index of the closest code in the code book.
Signature
predict(opts: object): Promise<ArrayLike>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | New data to predict. |
opts.sample_weight? | ArrayLike | The weights for each observation in X. If undefined, all observations are assigned equal weight. |
Returns
Promise<ArrayLike>
Defined in: generated/cluster/KMeans.ts:360 (opens in a new tab)
score()
Opposite of the value of X on the K-means objective.
Signature
score(opts: object): Promise<number>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | New data. |
opts.sample_weight? | ArrayLike | The weights for each observation in X. If undefined, all observations are assigned equal weight. |
opts.y? | any | Not used, present here for API consistency by convention. |
Returns
Promise<number>
Defined in: generated/cluster/KMeans.ts:400 (opens in a new tab)
set_output()
Set output container.
See Introducing the set_output API for an example on how to use the API.
Signature
set_output(opts: object): Promise<any>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.transform? | "default" | "pandas" | Configure output of transform and fit\_transform. |
Returns
Promise<any>
Defined in: generated/cluster/KMeans.ts:449 (opens in a new tab)
transform()
Transform X to a cluster-distance space.
In the new space, each dimension is the distance to the cluster centers. Note that even if X is sparse, the array returned by transform will typically be dense.
Signature
transform(opts: object): Promise<ArrayLike[]>;Parameters
| Name | Type | Description |
|---|---|---|
opts | object | - |
opts.X? | ArrayLike | New data to transform. |
Returns
Promise<ArrayLike[]>
Defined in: generated/cluster/KMeans.ts:484 (opens in a new tab)