Removed accidental TensorFlow dependency (#21066)
Summary:
I accidentally added a TF dependency in #20413 by using the from tensorboard.plugins.mesh.summary import _get_json_config import.
I'm removing it at the cost of code duplication.
orionr, Please review.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21066
Reviewed By: natalialunova
Differential Revision: D15538746
Pulled By: orionr
fbshipit-source-id: 8a822719a4a9f5d67f1badb474e3a73cefce507f
