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Cannot import torchaudio with torch 1.1

See original GitHub issue

I am trying to use torchaudio with torch 1.1. It compiled successfully with Python 3.6, but when I want to import the torchaudio package, I get this error:

>>> import torchaudio
Traceback (most recent call last):
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torch/jit/annotations.py", line 95, in parse_type_line
    arg_ann = eval(arg_ann_str, _eval_env)
  File "<string>", line 1, in <module>
NameError: name 'Optional' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torchaudio-0.2-py3.6-linux-x86_64.egg/torchaudio/__init__.py", line 7, in <module>
    from torchaudio import transforms, datasets, kaldi_io, sox_effects, legacy
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torchaudio-0.2-py3.6-linux-x86_64.egg/torchaudio/transforms.py", line 6, in <module>
    from . import functional as F
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torchaudio-0.2-py3.6-linux-x86_64.egg/torchaudio/functional.py", line 108, in <module>
    @torch.jit.script
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torch/jit/__init__.py", line 824, in script
    fn = torch._C._jit_script_compile(ast, _rcb, get_default_args(obj))
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torch/jit/annotations.py", line 55, in get_signature
    return parse_type_line(type_line)
  File "/home/daniel/envs/pytorch-py3/lib/python3.6/site-packages/torch/jit/annotations.py", line 97, in parse_type_line
    raise RuntimeError("Failed to parse the argument list of a type annotation: {}".format(str(e)))
RuntimeError: Failed to parse the argument list of a type annotation: name 'Optional' is not defined

It ran fine on torch 1.0 - maybe some problem with differing source code between torch 1.0 and 1.1?