I can't import PyTorch, libomp.dylib can't be loaded.

[kaszperro]

🐛 Bug

I tried to install PyTorch, but I can't use it. It can't link dynamic library libomp.dylib

To Reproduce

Steps to reproduce the behavior:

1. pipenv install torch torchvision
2. from torch.utils.data import Dataset

Traceback (most recent call last):
  File "/Users/kaspersapala/Documents/Airly/new-pollution-forecast/Datasets/__init__.py", line 3, in <module>
    from torch.utils.data import Dataset
  File "/Users/kaspersapala/.local/share/virtualenvs/new-pollution-forecast-BSetKF9E/lib/python3.7/site-packages/torch/__init__.py", line 79, in <module>
    from torch._C import *
ImportError: dlopen(/Users/kaspersapala/.local/share/virtualenvs/new-pollution-forecast-BSetKF9E/lib/python3.7/site-packages/torch/_C.cpython-37m-darwin.so, 9): Library not loaded: /usr/local/opt/libomp/lib/libomp.dylib
  Referenced from: /Users/kaspersapala/.local/share/virtualenvs/new-pollution-forecast-BSetKF9E/lib/python3.7/site-packages/torch/lib/libshm.dylib
  Reason: image not found

Expected behavior

Being able to use and import PyTorch

Environment

• PyTorch Version (e.g., 1.0): 1.1.0
• OS (e.g., Linux): Mac OS Mojave
• How you installed PyTorch (conda, pip, source): pipenv
• Python version: 3.7.1

[kaszperro]

brew install libomp solves the problem.

[ezyang]

cc @JerryShih