import pytorch_lightning as pl
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/__init__.py", line 63, in <module>
    from pytorch_lightning.callbacks import Callback
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/callbacks/__init__.py", line 14, in <module>
    from pytorch_lightning.callbacks.base import Callback
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/callbacks/base.py", line 22, in <module>
    from pytorch_lightning.core.lightning import LightningModule
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/core/__init__.py", line 16, in <module>
    from pytorch_lightning.core.lightning import LightningModule
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/core/lightning.py", line 39, in <module>
    from pytorch_lightning.core.saving import ALLOWED_CONFIG_TYPES, ModelIO, PRIMITIVE_TYPES
  File "/usr/local/lib/python3.6/dist-packages/pytorch_lightning/core/saving.py", line 41, in <module>
    from omegaconf.errors import UnsupportedValueType, ValidationError
ImportError: cannot import name 'UnsupportedValueType'