pytorch

76e187aa - Port `gather` to structured kernel (#63312)

Port `gather` to structured kernel (#63312) Summary: Will add a description once this is ready for review. cc: ysiraichi ezyang Pull Request resolved: https://github.com/pytorch/pytorch/pull/63312 Reviewed By: iramazanli Differential Revision: D30597447 Pulled By: ezyang fbshipit-source-id: d36e59835c2f4b38e286032dd2a1111a7e16b7e5