Refactor LibriSpeech tests to accommodate different dataset classes (#2392)

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/2392

Refactors LibriSpeech tests to accommodate different dataset classes

Reviewed By: xiaohui-zhang

Differential Revision: D36387835

fbshipit-source-id: 73b4e7565b4a077b25f036f4bd854ac7f2194b28

test/torchaudio_unittest/datasets/librispeech_test.py

-import os
-from pathlib import Path
-
 from torchaudio.datasets import librispeech
-from torchaudio_unittest.common_utils import (
-    get_whitenoise,
-    normalize_wav,
-    save_wav,
-    TempDirMixin,
-    TorchaudioTestCase,
-)
-
-# Used to generate a unique transcript for each dummy audio file
-_NUMBERS = ["ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE"]
-
-
-def get_mock_dataset(root_dir):
-    """
-    root_dir: directory to the mocked dataset
-    """
-    mocked_data = []
-    dataset_dir = os.path.join(root_dir, librispeech.FOLDER_IN_ARCHIVE, librispeech.URL)
-    os.makedirs(dataset_dir, exist_ok=True)
-    sample_rate = 16000  # 16kHz
-    seed = 0
-
-    for speaker_id in range(5):
-        speaker_path = os.path.join(dataset_dir, str(speaker_id))
-        os.makedirs(speaker_path, exist_ok=True)
-
-        for chapter_id in range(3):
-            chapter_path = os.path.join(speaker_path, str(chapter_id))
-            os.makedirs(chapter_path, exist_ok=True)
-            trans_content = []
-
-            for utterance_id in range(10):
-                filename = f"{speaker_id}-{chapter_id}-{utterance_id:04d}.wav"
-                path = os.path.join(chapter_path, filename)
-
-                transcript = " ".join([_NUMBERS[x] for x in [speaker_id, chapter_id, utterance_id]])
-                trans_content.append(f"{speaker_id}-{chapter_id}-{utterance_id:04d} {transcript}")
-
-                data = get_whitenoise(sample_rate=sample_rate, duration=0.01, n_channels=1, dtype="float32", seed=seed)
-                save_wav(path, data, sample_rate)
-                sample = (normalize_wav(data), sample_rate, transcript, speaker_id, chapter_id, utterance_id)
-                mocked_data.append(sample)
-
-                seed += 1
-
-            trans_filename = f"{speaker_id}-{chapter_id}.trans.txt"
-            trans_path = os.path.join(chapter_path, trans_filename)
-            with open(trans_path, "w") as f:
-                f.write("\n".join(trans_content))
-    return mocked_data
-
-
-class TestLibriSpeech(TempDirMixin, TorchaudioTestCase):
-    backend = "default"
-
-    root_dir = None
-    samples = []
-
-    @classmethod
-    def setUpClass(cls):
-        cls.root_dir = cls.get_base_temp_dir()
-        cls.samples = get_mock_dataset(cls.root_dir)
-
-    @classmethod
-    def tearDownClass(cls):
-        # In case of test failure
-        librispeech.LIBRISPEECH._ext_audio = ".flac"
-
-    def _test_librispeech(self, dataset):
-        num_samples = 0
-        for i, (data, sample_rate, transcript, speaker_id, chapter_id, utterance_id) in enumerate(dataset):
-            self.assertEqual(data, self.samples[i][0], atol=5e-5, rtol=1e-8)
-            assert sample_rate == self.samples[i][1]
-            assert transcript == self.samples[i][2]
-            assert speaker_id == self.samples[i][3]
-            assert chapter_id == self.samples[i][4]
-            assert utterance_id == self.samples[i][5]
-            num_samples += 1
-
-        assert num_samples == len(self.samples)
-        librispeech.LIBRISPEECH._ext_audio = ".flac"
+from torchaudio_unittest.common_utils import TorchaudioTestCase
+from torchaudio_unittest.datasets.librispeech_test_impl import LibriSpeechTestMixin
 
-    def test_librispeech_str(self):
-        librispeech.LIBRISPEECH._ext_audio = ".wav"
-        dataset = librispeech.LIBRISPEECH(self.root_dir)
-        self._test_librispeech(dataset)
 
-    def test_librispeech_path(self):
-        librispeech.LIBRISPEECH._ext_audio = ".wav"
-        dataset = librispeech.LIBRISPEECH(Path(self.root_dir))
-        self._test_librispeech(dataset)
+class TestLibriSpeech(LibriSpeechTestMixin, TorchaudioTestCase):
+    librispeech_cls = librispeech.LIBRISPEECH

test/torchaudio_unittest/datasets/librispeech_test_impl.py

+import os
+from pathlib import Path
+
+from torchaudio.datasets import librispeech
+from torchaudio_unittest.common_utils import (
+    get_whitenoise,
+    normalize_wav,
+    save_wav,
+    TempDirMixin,
+)
+
+# Used to generate a unique transcript for each dummy audio file
+_NUMBERS = ["ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE"]
+
+
+def get_mock_dataset(root_dir):
+    """
+    root_dir: directory to the mocked dataset
+    """
+    mocked_data = []
+    dataset_dir = os.path.join(root_dir, librispeech.FOLDER_IN_ARCHIVE, librispeech.URL)
+    os.makedirs(dataset_dir, exist_ok=True)
+    sample_rate = 16000  # 16kHz
+    seed = 0
+
+    for speaker_id in range(5):
+        speaker_path = os.path.join(dataset_dir, str(speaker_id))
+        os.makedirs(speaker_path, exist_ok=True)
+
+        for chapter_id in range(3):
+            chapter_path = os.path.join(speaker_path, str(chapter_id))
+            os.makedirs(chapter_path, exist_ok=True)
+            trans_content = []
+
+            for utterance_id in range(10):
+                filename = f"{speaker_id}-{chapter_id}-{utterance_id:04d}.wav"
+                path = os.path.join(chapter_path, filename)
+
+                transcript = " ".join([_NUMBERS[x] for x in [speaker_id, chapter_id, utterance_id]])
+                trans_content.append(f"{speaker_id}-{chapter_id}-{utterance_id:04d} {transcript}")
+
+                data = get_whitenoise(sample_rate=sample_rate, duration=0.01, n_channels=1, dtype="float32", seed=seed)
+                save_wav(path, data, sample_rate)
+                sample = (normalize_wav(data), sample_rate, transcript, speaker_id, chapter_id, utterance_id)
+                mocked_data.append(sample)
+
+                seed += 1
+
+            trans_filename = f"{speaker_id}-{chapter_id}.trans.txt"
+            trans_path = os.path.join(chapter_path, trans_filename)
+            with open(trans_path, "w") as f:
+                f.write("\n".join(trans_content))
+    return mocked_data
+
+
+class LibriSpeechTestMixin(TempDirMixin):
+    backend = "default"
+
+    root_dir = None
+    samples = []
+
+    @classmethod
+    def setUpClass(cls):
+        cls.root_dir = cls.get_base_temp_dir()
+        cls.samples = get_mock_dataset(cls.root_dir)
+
+    @classmethod
+    def tearDownClass(cls):
+        # In case of test failure
+        cls.librispeech_cls._ext_audio = ".flac"
+
+    def _test_librispeech(self, dataset):
+        num_samples = 0
+        for i, (data, sample_rate, transcript, speaker_id, chapter_id, utterance_id) in enumerate(dataset):
+            self.assertEqual(data, self.samples[i][0], atol=5e-5, rtol=1e-8)
+            assert sample_rate == self.samples[i][1]
+            assert transcript == self.samples[i][2]
+            assert speaker_id == self.samples[i][3]
+            assert chapter_id == self.samples[i][4]
+            assert utterance_id == self.samples[i][5]
+            num_samples += 1
+
+        assert num_samples == len(self.samples)
+        self.librispeech_cls._ext_audio = ".flac"
+
+    def test_librispeech_str(self):
+        self.librispeech_cls._ext_audio = ".wav"
+        dataset = self.librispeech_cls(self.root_dir)
+        self._test_librispeech(dataset)
+
+    def test_librispeech_path(self):
+        self.librispeech_cls._ext_audio = ".wav"
+        dataset = self.librispeech_cls(Path(self.root_dir))
+        self._test_librispeech(dataset)