Review for NeurIPS paper: Unsupervised Learning of Object Landmarks via Self-Training Correspondence

Additional Feedback: Detailed feedback: 1. Authors state that "[other] methods, despite presenting consistent results for various object categories, have also their own limitations such as discovering landmarks with no clear semantic meaning." This claim is rather strong since the proposed method also does not guarantee any clear semantic meaning for object landmarks discovered by their method. That work actually reports better accuracy on BBCPose than the proposed method and hence should be also included. Since the paper is trying to distinguish between "keypoints/landmarks" and "object landmarks" it would be helpful to have a clear definition and use them consistently. For example, in the introduction, the three words are used interchangeably but then in the section 3 "keypoints and landmarks" refer to very different entities than "object landmarks".