Summary:
There is a module called `2to3` which you can target for future specifically to remove these, the directory of `caffe2` has the most redundant imports:
```2to3 -f future -w caffe2```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45033
Reviewed By: seemethere
Differential Revision: D23808648
Pulled By: bugra
fbshipit-source-id: 38971900f0fe43ab44a9168e57f2307580d36a38
Summary: We have to use copy constructor in Concat when copying non-primitive types
Reviewed By: Yangqing
Differential Revision: D6002883
fbshipit-source-id: 0aebc955079975bb6423291589ed09ce0660acf3