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To effectively utilize these sparse annotations during network training, we\u2019ve crafted an innovative self-training strategy. This involves alternating between training phases and label spreading, powered by a graph propagation module. Additionally, we integrate a relation network to create category-specific prototypes, improving pseudo label accuracy and steering the training process. Our approach also seamlessly integrates with 3D instance segmentation, incorporating a point-clustering technique. Our method demonstrates superior performance over other weakly supervised strategies for 3D semantic and instance segmentation, as evidenced by tests on both ScanNet-v2 and S3DIS datasets. Remarkably, the efficacy of our self-training method with limited annotations rivals that of fully supervised models. 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