Update devices.py

# has_mps is only available in nightly pytorch (for now) and MasOS 12.3+.

# check `getattr` and try it for compatibility

def has_mps() -> bool:

    if getattr(torch, 'has_mps', False): return False

    if not getattr(torch, 'has_mps', False): return False

    try:

        torch.zeros(1).to(torch.device("mps"))

        return True