sklearn.metrics
.silhouette_samples¶

sklearn.metrics.
silhouette_samples
(X, labels, *, metric='euclidean', **kwds)[source]¶ Compute the Silhouette Coefficient for each sample.
The Silhouette Coefficient is a measure of how well samples are clustered with samples that are similar to themselves. Clustering models with a high Silhouette Coefficient are said to be dense, where samples in the same cluster are similar to each other, and well separated, where samples in different clusters are not very similar to each other.
The Silhouette Coefficient is calculated using the mean intracluster distance (
a
) and the mean nearestcluster distance (b
) for each sample. The Silhouette Coefficient for a sample is(b  a) / max(a, b)
. Note that Silhouette Coefficient is only defined if number of labels is 2<= n_labels <= n_samples  1
.This function returns the Silhouette Coefficient for each sample.
The best value is 1 and the worst value is 1. Values near 0 indicate overlapping clusters.
Read more in the User Guide.
 Parameters
 Xarraylike of shape (n_samples_a, n_samples_a) if metric == “precomputed” or (n_samples_a, n_features) otherwise
An array of pairwise distances between samples, or a feature array.
 labelsarraylike of shape (n_samples,)
Label values for each sample.
 metricstr or callable, default=’euclidean’
The metric to use when calculating distance between instances in a feature array. If metric is a string, it must be one of the options allowed by
sklearn.metrics.pairwise.pairwise_distances
. IfX
is the distance array itself, use “precomputed” as the metric. Precomputed distance matrices must have 0 along the diagonal. `**kwds`optional keyword parameters
Any further parameters are passed directly to the distance function. If using a
scipy.spatial.distance
metric, the parameters are still metric dependent. See the scipy docs for usage examples.
 Returns
 silhouettearraylike of shape (n_samples,)
Silhouette Coefficients for each sample.
References