torch/monitor: TensorboardEventHandler (#71658)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71658
This adds the beginnings of a TensorboardEventHandler which will log stats to Tensorboard.
Test Plan: buck test //caffe2/test:monitor
Reviewed By: edward-io
Differential Revision: D33719954
fbshipit-source-id: e9847c1319255ce0d9cf2d85d8b54b7a3c681bd2
(cherry picked from commit 5c8520a6baea51db02e4e29d0210b3ced60fa18d)
