Implement tensor.select(Dimname,int) (#21795)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21795
ghimport-source-id: d13af6078a47de1d6045cfbb7d278c378fe734fe
Test Plan: Imported from OSS
Differential Revision: D15833457
Pulled By: zou3519
fbshipit-source-id: fa52aff25ce0e12f31da3eef83ea948b4f7a5d9f
