Fix torchvision install

Author: Will Feng

.jenkins/build.sh

@@ -25,11 +25,8 @@ pip install -e git+git://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch
 # this is a workaround to the issue.
 pip install sphinx-gallery tqdm matplotlib ipython pillow==4.1.1
 
-# Install torchvision from source
-git clone https://github.com/pytorch/vision --quiet
-pushd vision
-pip install . --no-deps  # We don't want it to install the stock PyTorch version from pip
-popd
+# Install torchvision from pip
+pip install torchvision --no-deps
 
 # Install torchaudio from source
 git clone https://github.com/pytorch/audio --quiet