pytorch

e9bc82f5 - Vectorize torch.exp2 on CPU and add complex support (#92115)

Vectorize torch.exp2 on CPU and add complex support (#92115) I see an 11x speedup in `exp2` on CPU from this. Pull Request resolved: https://github.com/pytorch/pytorch/pull/92115 Approved by: https://github.com/lezcano, https://github.com/ngimel