Pass the input tensor vector by const reference. (#44340)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44340
Changed the constructor of GradBucket to pass the input by const
reference and hence avoided unnecessary explicit move semantics. Since
previously the declaration and definition are separated, passing the input
tensor vector by value looks quite bizarre.
Test Plan: buck test caffe2/torch/lib/c10d:ProcessGroupGlooTest
Reviewed By: pritamdamania87
Differential Revision: D23569939
fbshipit-source-id: db761d42e76bf938089a0b38e98e76a05bcf4162
