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1 # Natural Language Toolkit 2 # 3 # Author: Sumukh Ghodke <sumukh dot ghodke at gmail dot com> 4 # 5 # URL: <http://nltk.sf.net> 6 # This software is distributed under GPL, for license information see LICENSE.TXT 7 8 from nltk_lite.contrib.classifier import oner, instances as ins, format 9 from nltk_lite.contrib.classifier_tests import * 10 from nltk_lite.contrib.classifier.exceptions import invaliddataerror as inv 111354 55 6215 path = self.WEATHER = datasetsDir(self) + 'minigolf' + SEP + 'weather' 16 c45 = format.C45_FORMAT 17 self.classifier = oner.OneR(c45.get_training_instances(path), c45.get_attributes(path), c45.get_klass(path))1820 minError = self.classifier.best_decision_stump(self.classifier.training) 21 self.assertAlmostEqual(0.2222222, minError.error())2224 self.classifier.test(format.C45_FORMAT.get_test_instances(self.WEATHER), False) 25 self.assertTrue(self.classifier.test_instances[0].classified_klass is not None) 26 self.assertEqual('yes', self.classifier.test_instances[0].classified_klass)2729 cm = self.classifier.verify(format.C45_FORMAT.get_gold_instances(self.WEATHER)) 30 self.assertEqual(0.5, cm.accuracy()) 31 self.assertAlmostEqual(0.6666667, cm.fscore())3234 path = self.WEATHER 35 c45 = format.C45_FORMAT 36 classifier = OneRStub(c45.get_training_instances(path), c45.get_attributes(path), c45.get_klass(path)) 37 self.assertEqual("dummy Best Decision stump", classifier.best_decision_stump(classifier.training, [], 'dummy_algorithm'))3840 try: 41 self.classifier.best_decision_stump(self.classifier.training, [], 'invalid_algorithm') 42 self.fail('should throw error') 43 except inv.InvalidDataError: 44 pass4547 try: 48 path = datasetsDir(self) + 'numerical' + SEP + 'weather' 49 c45 = format.C45_FORMAT 50 classifier = oner.OneR(c45.get_training_instances(path), c45.get_attributes(path), c45.get_klass(path)) 51 self.fail('should have thrown error') 52 except inv.InvalidDataError: 53 pass
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