@fmassa pytorch.org 5 suggests
conda install pytorch torchvision cudatoolkit=10.0 -c pytorch-nightly

To get the latest nightly packages for PyTorch and torchvision.
So can I assume
conda update pytorch torchvision -c pytorch-nightly

Is the right way to update them both?
I currently cannot update both (torchvision forced PyTorch to donwgrade):
The following packages will be UPDATED:
  torchvision        pytorch::torchvision-0.3.0-py36_cu10.~ --> pytorch-nightly::torchvision-0.5.0.dev20190917-py36_cu100

The following packages will be DOWNGRADED:

  pytorch            1.3.0.dev20191002-py3.6_cuda10.0.130_~ --> 1.3.0.dev20190917-py3.6_cuda10.0.130_cudnn7.6.2_0

I just wan to know if this is normal or my setup is wrong. Also, I cannot load latest released torchvison against nightly PyTorch:
ImportError: /home/ehazar/miniconda3/envs/py3_night/lib/python3.6/site-packages/torchvision/_C.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN3c1011CPUTensorIdEv