Rename files to make it private

Author: fmassa

test/test_video_reader.py

@@ -25,7 +25,7 @@
     from urllib.error import URLError
 
 
-from torchvision.io.video_plus import _HAS_VIDEO_PLUS
+from torchvision.io._video_opt import _HAS_VIDEO_OPT
 
 
 VIDEO_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "assets", "videos")
@@ -268,7 +268,7 @@ def _get_video_tensor(video_dir, video_file):
 
 
 @unittest.skipIf(av is None, "PyAV unavailable")
-@unittest.skipIf(_HAS_VIDEO_PLUS is False, "Didn't compile with ffmpeg")
+@unittest.skipIf(_HAS_VIDEO_OPT is False, "Didn't compile with ffmpeg")
 class TestVideoReader(unittest.TestCase):
     def check_separate_decoding_result(self, tv_result, config):
         """check the decoding results from TorchVision decoder

torchvision/io/__init__.py

@@ -1,8 +1,7 @@
 from .video import write_video, read_video, read_video_timestamps
-from .video_plus import _read_video_from_file, _read_video_timestamps_from_file
+from ._video_opt import _read_video_from_file, _read_video_timestamps_from_file
 
 
 __all__ = [
     'write_video', 'read_video', 'read_video_timestamps',
-    '_read_video_from_file', '_read_video_timestamps_from_file',
 ]

torchvision/io/video_plus.py renamed to torchvision/io/_video_opt.py

@@ -6,13 +6,13 @@
 import warnings
 
 
-_HAS_VIDEO_PLUS = False
+_HAS_VIDEO_OPT = False
 
 try:
     lib_dir = os.path.join(os.path.dirname(__file__), '..')
     _, path, description = imp.find_module("video_reader", [lib_dir])
     torch.ops.load_library(path)
-    _HAS_VIDEO_PLUS = True
+    _HAS_VIDEO_OPT = True
 except (ImportError, OSError):
     warnings.warn("video reader based on ffmpeg c++ ops not available")