sklearn.metrics.davies_bouldin_score¶

sklearn.metrics.davies_bouldin_score(X, labels)[source]¶

Computes the Davies-Bouldin score.

The score is defined as the average similarity measure of each cluster with its most similar cluster, where similarity is the ratio of within-cluster distances to between-cluster distances. Thus, clusters which are farther apart and less dispersed will result in a better score.

The minimum score is zero, with lower values indicating better clustering.

Read more in the User Guide.

New in version 0.20.

Parameters

Xarray-like of shape (n_samples, n_features)

A list of n_features-dimensional data points. Each row corresponds to a single data point.

labelsarray-like of shape (n_samples,)

Predicted labels for each sample.

Returns

score: float

The resulting Davies-Bouldin score.

References

1

Davies, David L.; Bouldin, Donald W. (1979). “A Cluster Separation Measure”. IEEE Transactions on Pattern Analysis and Machine Intelligence. PAMI-1 (2): 224-227