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| # Copyright 2021 The HuggingFace Evaluate Authors. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| import unittest | |
| from cer import CER | |
| cer = CER() | |
| class TestCER(unittest.TestCase): | |
| def test_cer_case_sensitive(self): | |
| refs = ["White House"] | |
| preds = ["white house"] | |
| # S = 2, D = 0, I = 0, N = 11, CER = 2 / 11 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.1818181818) < 1e-6) | |
| def test_cer_whitespace(self): | |
| refs = ["were wolf"] | |
| preds = ["werewolf"] | |
| # S = 0, D = 0, I = 1, N = 9, CER = 1 / 9 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.1111111) < 1e-6) | |
| refs = ["werewolf"] | |
| preds = ["weae wolf"] | |
| # S = 1, D = 1, I = 0, N = 8, CER = 0.25 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.25) < 1e-6) | |
| # consecutive whitespaces case 1 | |
| refs = ["were wolf"] | |
| preds = ["were wolf"] | |
| # S = 0, D = 0, I = 0, N = 9, CER = 0 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.0) < 1e-6) | |
| # consecutive whitespaces case 2 | |
| refs = ["were wolf"] | |
| preds = ["were wolf"] | |
| # S = 0, D = 0, I = 0, N = 9, CER = 0 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.0) < 1e-6) | |
| def test_cer_sub(self): | |
| refs = ["werewolf"] | |
| preds = ["weaewolf"] | |
| # S = 1, D = 0, I = 0, N = 8, CER = 0.125 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.125) < 1e-6) | |
| def test_cer_del(self): | |
| refs = ["werewolf"] | |
| preds = ["wereawolf"] | |
| # S = 0, D = 1, I = 0, N = 8, CER = 0.125 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.125) < 1e-6) | |
| def test_cer_insert(self): | |
| refs = ["werewolf"] | |
| preds = ["wereolf"] | |
| # S = 0, D = 0, I = 1, N = 8, CER = 0.125 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.125) < 1e-6) | |
| def test_cer_equal(self): | |
| refs = ["werewolf"] | |
| char_error_rate = cer.compute(predictions=refs, references=refs) | |
| self.assertEqual(char_error_rate, 0.0) | |
| def test_cer_list_of_seqs(self): | |
| refs = ["werewolf", "I am your father"] | |
| char_error_rate = cer.compute(predictions=refs, references=refs) | |
| self.assertEqual(char_error_rate, 0.0) | |
| refs = ["werewolf", "I am your father", "doge"] | |
| preds = ["werxwolf", "I am your father", "doge"] | |
| # S = 1, D = 0, I = 0, N = 28, CER = 1 / 28 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.03571428) < 1e-6) | |
| def test_correlated_sentences(self): | |
| refs = ["My hovercraft", "is full of eels"] | |
| preds = ["My hovercraft is full", " of eels"] | |
| # S = 0, D = 0, I = 2, N = 28, CER = 2 / 28 | |
| # whitespace at the front of " of eels" will be strip during preporcessing | |
| # so need to insert 2 whitespaces | |
| char_error_rate = cer.compute(predictions=preds, references=refs, concatenate_texts=True) | |
| self.assertTrue(abs(char_error_rate - 0.071428) < 1e-6) | |
| def test_cer_unicode(self): | |
| refs = ["我能吞下玻璃而不伤身体"] | |
| preds = [" 能吞虾玻璃而 不霜身体啦"] | |
| # S = 3, D = 2, I = 0, N = 11, CER = 5 / 11 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.4545454545) < 1e-6) | |
| refs = ["我能吞下玻璃", "而不伤身体"] | |
| preds = ["我 能 吞 下 玻 璃", "而不伤身体"] | |
| # S = 0, D = 5, I = 0, N = 11, CER = 5 / 11 | |
| char_error_rate = cer.compute(predictions=preds, references=refs) | |
| self.assertTrue(abs(char_error_rate - 0.454545454545) < 1e-6) | |
| refs = ["我能吞下玻璃而不伤身体"] | |
| char_error_rate = cer.compute(predictions=refs, references=refs) | |
| self.assertFalse(char_error_rate, 0.0) | |
| def test_cer_empty(self): | |
| refs = [""] | |
| preds = ["Hypothesis"] | |
| with self.assertRaises(ValueError): | |
| cer.compute(predictions=preds, references=refs) | |
| if __name__ == "__main__": | |
| unittest.main() | |