PR: Add UCF101 dataset tests (#2548)

* Add fake data generator for UCF101

* Minor error correction

* Reduce total number of categories

* Fix naming

* Increase length

* Store in uint8

* Close fds

* Add assertGreater

* Add dimension tests

* Use numel instead of size

* Iterate over folds and splits

test/fakedata_generation.py

@@ -7,6 +7,9 @@ import PIL
 import torch
 from common_utils import get_tmp_dir
 import pickle
+import random
+from itertools import cycle
+from torchvision.io.video import write_video
 
 
 @contextlib.contextmanager
@@ -265,3 +268,47 @@ def voc_root():
             f.write('test')
 
         yield tmp_dir
+
+
+@contextlib.contextmanager
+def ucf101_root():
+    with get_tmp_dir() as tmp_dir:
+        ucf_dir = os.path.join(tmp_dir, 'UCF-101')
+        video_dir = os.path.join(ucf_dir, 'video')
+        annotations = os.path.join(ucf_dir, 'annotations')
+
+        os.makedirs(ucf_dir)
+        os.makedirs(video_dir)
+        os.makedirs(annotations)
+
+        fold_files = []
+        for split in {'train', 'test'}:
+            for fold in range(1, 4):
+                fold_file = '{:s}list{:02d}.txt'.format(split, fold)
+                fold_files.append(os.path.join(annotations, fold_file))
+
+        file_handles = [open(x, 'w') for x in fold_files]
+        file_iter = cycle(file_handles)
+
+        for i in range(0, 2):
+            current_class = 'class_{0}'.format(i + 1)
+            class_dir = os.path.join(video_dir, current_class)
+            os.makedirs(class_dir)
+            for group in range(0, 3):
+                for clip in range(0, 4):
+                    # Save sample file
+                    clip_name = 'v_{0}_g{1}_c{2}.avi'.format(
+                        current_class, group, clip)
+                    clip_path = os.path.join(class_dir, clip_name)
+                    length = random.randrange(10, 21)
+                    this_clip = torch.randint(
+                        0, 256, (length * 25, 320, 240, 3), dtype=torch.uint8)
+                    write_video(clip_path, this_clip, 25)
+                    # Add to annotations
+                    ann_file = next(file_iter)
+                    ann_file.write('{0}\n'.format(
+                        os.path.join(current_class, clip_name)))
+        # Close all file descriptors
+        for f in file_handles:
+            f.close()
+        yield (video_dir, annotations)

test/test_datasets.py

@@ -9,7 +9,7 @@ from torch._utils_internal import get_file_path_2
 import torchvision
 from common_utils import get_tmp_dir
 from fakedata_generation import mnist_root, cifar_root, imagenet_root, \
-    cityscapes_root, svhn_root, voc_root
+    cityscapes_root, svhn_root, voc_root, ucf101_root
 import xml.etree.ElementTree as ET
 
 
@@ -19,6 +19,12 @@ try:
 except ImportError:
     HAS_SCIPY = False
 
+try:
+    import av
+    HAS_PYAV = True
+except ImportError:
+    HAS_PYAV = False
+
 
 class Tester(unittest.TestCase):
     def generic_classification_dataset_test(self, dataset, num_images=1):
@@ -254,6 +260,26 @@ class Tester(unittest.TestCase):
                                  }]
                              }})
 
+    @unittest.skipIf(not HAS_PYAV, "PyAV unavailable")
+    def test_ucf101(self):
+        with ucf101_root() as (root, ann_root):
+            for split in {True, False}:
+                for fold in range(1, 4):
+                    for length in {10, 15, 20}:
+                        dataset = torchvision.datasets.UCF101(
+                            root, ann_root, length, fold=fold, train=split)
+                        self.assertGreater(len(dataset), 0)
+
+                        video, audio, label = dataset[0]
+                        self.assertEqual(video.size(), (length, 320, 240, 3))
+                        self.assertEqual(audio.numel(), 0)
+                        self.assertEqual(label, 0)
+
+                        video, audio, label = dataset[len(dataset) - 1]
+                        self.assertEqual(video.size(), (length, 320, 240, 3))
+                        self.assertEqual(audio.numel(), 0)
+                        self.assertEqual(label, 1)
+
 
 if __name__ == '__main__':
     unittest.main()