I build pytorch from source.

All distributed tests failed on MAC:
Running distributed tests for the TCP backend
Process process 0:
Process process 1:
Process process 2:
Traceback (most recent call last):
File "/usr/local/anaconda3/envs/pytorch-dev/lib/python3.6/multiprocessing/process.py", line 249, in _bootstrap
self.run()
File "/usr/local/anaconda3/envs/pytorch-dev/lib/python3.6/multiprocessing/process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "./test_distributed.py", line 534, in _run
getattr(self, self.id().split(".")[2])()
File "./test_distributed.py", line 493, in wrapper
fn(self)
File "./test_distributed.py", line 445, in test_all_gather
group, group_id, rank = self._init_global_test()
File "./test_distributed.py", line 90, in _init_global_test
group = [i for i in range(0, dist.get_world_size())]
AttributeError: module 'torch.distributed' has no attribute 'get_world_size'
......
FAILED (failures=31, skipped=2)

Is it normal?