Implement NumPy-like function torch.float_power() (#44937)
Summary:
- Related with https://github.com/pytorch/pytorch/issues/38349
- Implementing the NumPy-like function `torch.float_power()` .
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44937
Reviewed By: ngimel
Differential Revision: D25192119
Pulled By: mruberry
fbshipit-source-id: 2e446b8e0c2825f045fe057e30c9419335557a05