initialize with ident value in global reduction (#15653)
Summary:
Fixes #15647. cc colesbury.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15653
Differential Revision: D13571132
Pulled By: soumith
fbshipit-source-id: 8f25943c974b3b931f4528e0e0a370bc095dab51
Author
Natalia Gimelshein
