about pytorchvideo

when I run file named run_net.py,I got an error:ImportError: cannot import name 'LabeledVideoDataset' from 'pytorchvideo.data' (/home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages/pytorchvideo/data/__init__.py),I doubt that is my module pytorchvideo is not installed properly,so I run the command 'pip install pytorchvideo' and got information:
'Requirement already satisfied: pytorchvideo in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (0.1.0)
Requirement already satisfied: parameterized in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from pytorchvideo) (0.8.1)
Requirement already satisfied: fvcore>=0.1.4 in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from pytorchvideo) (0.1.5)
Requirement already satisfied: av in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from pytorchvideo) (8.0.3)
Requirement already satisfied: iopath in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from pytorchvideo) (0.1.8)
Requirement already satisfied: tqdm in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (4.60.0)
Requirement already satisfied: yacs>=0.1.6 in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (0.1.8)
Requirement already satisfied: Pillow in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (8.2.0)
Requirement already satisfied: termcolor>=1.1 in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (1.1.0)
Requirement already satisfied: tabulate in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (0.8.9)
Requirement already satisfied: pyyaml>=5.1 in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (5.4.1)
Requirement already satisfied: numpy in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from fvcore>=0.1.4->pytorchvideo) (1.20.2)
Requirement already satisfied: portalocker in /home/shtf/anaconda3/envs/pysf/lib/python3.7/site-packages (from iopath->pytorchvideo) (2.3.0)
'
I have no idea about this,Can you offer any help？thanks