#NEWLINE# def feature_detector( self , tokens , index , history ) : #NEWLINE# #INDENT# '\n        Return the feature detector that this tagger uses to generate\n        featuresets for its classifier.  The feature detector is a\n        function with the signature::\n\n          feature_detector(tokens, index, history) -> featureset\n\n        See ``classifier()``\n        ' #NEWLINE# return self . _feature_detector ( tokens , history , history )