I think the pip wheels are built with numpy support, however numpy is not explicitly listed as a dependency.
When trying to import torch an import error occurs:
>>> import torch
ImportError: numpy.core.multiarray failed to import
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/private/var/folders/b5/hgpy98310bg_g3hfqngl759m0000gn/T/tmpCRcqEy/.deps/torch-0.1.12.post2-cp27-none-macosx_10_7_x86_64.whl/torch/__init__.py", line 53, in <module>
from torch._C import *
ImportError: numpy.core.multiarray failed to import
Installing numpy and then importing torch does work.