• OS: macos 10.11.6
• PyTorch version: 0.3post4
• How you installed PyTorch (conda, pip, source): pip
• Python version: 3.6.3

torch.Tensor(np.int64(1)) gives a TypeError because torch expects ints, and it got the type np.int64. However, that's still an int (for all practical purposes, even if isinstance(np.int64(1), int) equals False.