Add doctest for ClusterCentering

Makefile

@@ -19,9 +19,6 @@ clean:
 test:
 	$(NOSETESTS) -s -v imblearn
 
-# doctest:
-# 	$(PYTHON) -c "import imblearn, sys, io; sys.exit(imblearn.doctest_verbose())"
-
 coverage:
 	$(NOSETESTS) imblearn -s -v --with-coverage --cover-package=imblearn
 

imblearn/under_sampling/cluster_centroids.py

@@ -62,6 +62,23 @@ class ClusterCentroids(SamplerMixin):
     -----
     This class support multi-class.
 
+    Examples
+    --------
+
+    >>> import tempfile
+    >>> from collections import Counter
+    >>> from sklearn.datasets import fetch_mldata
+    >>> from imblearn.under_sampling import ClusterCentroids
+    >>> test_data_home = tempfile.mkdtemp()
+    >>> pima = fetch_mldata('diabetes_scale', data_home=test_data_home)
+    >>> X, y = pima['data'], pima['target']
+    >>> print('Original dataset shape {}'.format(Counter(y)))
+    Original dataset shape Counter({1: 500, -1: 268})
+    >>> cc = ClusterCentroids()
+    >>> X_res, y_res = cc.fit_sample(X, y)
+    >>> print('Resampled dataset shape {}'.format(Counter(y_res)))
+    Resampled dataset shape Counter({1: 268, -1: 268})
+
     """
 
     def __init__(self, ratio='auto', random_state=None, n_jobs=-1, **kwargs):