GitLab

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/330

- re-enable the `test_qat`
- remove `example_input` from `DetMetaArchForTest`, since its `custom_prepare_fx` just create a tensor for avgpool.

Reviewed By: jerryzh168

Differential Revision: D37793260

fbshipit-source-id: ec7a825c61292d9c6d792f910a957c1c27832336