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use get_feature_names from last step in pipeline if it is available #5172

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use get_feature_names from last step in pipeline if it is available #5172

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16 changes: 16 additions & 0 deletions sklearn/pipeline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,22 @@ def named_steps(self):
def _final_estimator(self):
return self.steps[-1][1]

def get_feature_names(self):
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I guess we should use if_delegate_has_method as below instead of the AttributeError here.

"""Get feature names from last step in pipeline

Returns
-------
feature_names : list of strings
Names of the features produced by last step in transform.
"""
last_step = self.steps[-1]
transformer = last_step[1]
name = last_step[0]
if not hasattr(transformer, 'get_feature_names'):
raise AttributeError("Transformer %s does not provide"
" get_feature_names." % str(name))
return transformer.get_feature_names()

# Estimator interface

def _pre_transform(self, X, y=None, **fit_params):
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