Results 1 issues of yili

I try to convert to tf2.2 version of Mask_rcnn, but following issue occured: ![image](https://user-images.githubusercontent.com/20442357/82293628-6b967280-99df-11ea-87d5-d92afeb468e6.png) when I modify the add_loss according to [issue_1896](https://github.com/matterport/Mask_RCNN/issues/1889#issuecomment-566217231),this error occured [issues_1911](https://github.com/matterport/Mask_RCNN/issues/1911), but using `tf.compat.v1.disable_eager_execution()` is not...