`sklearn.datasets`.make_blobs¶

sklearn.datasets.make_blobs(n_samples=100, n_features=2, centers=None, cluster_std=1.0, center_box=(-10.0, 10.0), shuffle=True, random_state=None)[source]¶

Generate isotropic Gaussian blobs for clustering.

Read more in the User Guide.

Parameters

n_samplesint or array-like, optional (default=100): If int, it is the total number of points equally divided among clusters. If array-like, each element of the sequence indicates the number of samples per cluster.
n_featuresint, optional (default=2): The number of features for each sample.
centersint or array of shape [n_centers, n_features], optional: (default=None) The number of centers to generate, or the fixed center locations. If n_samples is an int and centers is None, 3 centers are generated. If n_samples is array-like, centers must be either None or an array of length equal to the length of n_samples.
cluster_stdfloat or sequence of floats, optional (default=1.0): The standard deviation of the clusters.
center_boxpair of floats (min, max), optional (default=(-10.0, 10.0)): The bounding box for each cluster center when centers are generated at random.
shuffleboolean, optional (default=True): Shuffle the samples.
random_stateint, RandomState instance or None (default): Determines random number generation for dataset creation. Pass an int for reproducible output across multiple function calls. See Glossary.

Returns

Xarray of shape [n_samples, n_features]: The generated samples.
yarray of shape [n_samples]: The integer labels for cluster membership of each sample.

See also

make_classification: a more intricate variant

Examples

>>> from sklearn.datasets.samples_generator import make_blobs
>>> X, y = make_blobs(n_samples=10, centers=3, n_features=2,
...                   random_state=0)
>>> print(X.shape)
(10, 2)
>>> y
array([0, 0, 1, 0, 2, 2, 2, 1, 1, 0])
>>> X, y = make_blobs(n_samples=[3, 3, 4], centers=None, n_features=2,
...                   random_state=0)
>>> print(X.shape)
(10, 2)
>>> y
array([0, 1, 2, 0, 2, 2, 2, 1, 1, 0])

sklearn.datasets.make_blobs¶

`sklearn.datasets`.make_blobs¶