I didn’t see errors when upgraded/downgraded to pytorch 1.1.0/1.0.1.post2. I encountered error when tried to do “pip install pytorch-fast-elmo”. It got interruption from allennlp:
ERROR: allennlp 0.9.0 has requirement torch>=1.2.0, but you'll have torch 1.0.1.post2 which is incompatible.
Installing collected packages: torch, pytorch-stateful-lstm, h5py, fire, pytorch-fast-elmo
  Found existing installation: torch 1.2.0
    Uninstalling torch-1.2.0:
      Successfully uninstalled torch-1.2.0
    Running setup.py install for pytorch-stateful-lstm ... done
  Found existing installation: h5py 2.10.0
    Uninstalling h5py-2.10.0:
      Successfully uninstalled h5py-2.10.0
    Running setup.py install for fire ... done
    Running setup.py install for pytorch-fast-elmo ... done
Successfully installed fire-0.1.3 h5py-2.9.0 pytorch-fast-elmo-0.6.12 pytorch-stateful-lstm-1.6.0 torch-1.0.1.post2

The CUDNN came in after this pip command. And then I reinstalled pytorch: I tried pytorch 1.1.0 first and then 1.0.1.post2 (which is the version I was using and worked fine before this pip command).