DOC Adds example for preprocessing.FunctionTransformer (#15192)

Andrea Maldonado · thomasjpfan · commit 5271695cec52 · 2019-10-15T16:21:48.000-04:00
diff --git a/sklearn/preprocessing/_function_transformer.py b/sklearn/preprocessing/_function_transformer.py
@@ -69,6 +69,15 @@ class FunctionTransformer(TransformerMixin, BaseEstimator):
     inv_kw_args : dict, optional
         Dictionary of additional keyword arguments to pass to inverse_func.
 
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from sklearn.preprocessing import FunctionTransformer
+    >>> transformer = FunctionTransformer(np.log1p)
+    >>> X = np.array([[0, 1], [2, 3]])
+    >>> transformer.transform(X)
+    array([[0.       , 0.6931...],
+           [1.0986..., 1.3862...]])
     """
     def __init__(self, func=None, inverse_func=None, validate=False,
                  accept_sparse=False, check_inverse=True, kw_args=None,
