Does ray support python2.7?

I have to use ray in a python2.7 environment. I tried the last version(perhaps) with torch 0.1.6.post20, but when I run ray.init(), there exists a problem:

  File "/usr/local/lib/python2.7/dist-packages/ray/pyarrow_files/pyarrow/", line 244, in register_torch_serialization_handlers
    for t in [torch.FloatTensor, torch.DoubleTensor, torch.HalfTensor,
AttributeError: 'module' object has no attribute 'HalfTensor'

So could any one help me out? Much thanks.