add size_based_partition final (#46282)
Summary:
Reopen the PR: https://github.com/pytorch/pytorch/pull/45837
This PR add a new feature for Partitioner() class called size_based_partition. Given a list of devices with the same memory size, this function could distribute graph nodes into different devices. To implement this feature, several help functions are created in Partitioner.py and GraphManipulation.py.
An unit test is also added in test/test_fx_experimental.py
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46282
Reviewed By: gcatron
Differential Revision: D24288470
Pulled By: scottxu0730
fbshipit-source-id: e81b1e0c56e34f61e497d868882126216eba7538
