In this paper, we study the problem of learning Graph Convolutional Networks (GCNs) for regression. Current architectures of GCNs are limited to the small receptive field of convolution filters and shared transformation matrix for each node. To address these limitations, we propose Semantic Graph Convolutional Networks (SemGCN), a novel neural network architecture that operates on regression tasks with graph-structured data. SemGCN learns to capture semantic information such as local and global node relationships, which is not explicitly represented in the graph. These semantic relationships can be learned through end-to-end training from the ground truth without additional supervision or hand-crafted rules. We further investigate applying SemGCN to 3D human pose regression. Our formulation is intuitive and sufficient since both 2D and 3D human poses can be represented as a structured graph encoding the relationships between joints in the skeleton of a human body. We carry out comprehensive studies to validate our method. The results prove that SemGCN outperforms state of the art while using 90% fewer parameters.

本文提出了一种新的神经网络结构Semantic Graph Convolutional Networks（SemGCN），它能够学习在回归任务中捕捉图形结构数据中的语义信息，特别是局部和全局节点之间的关系，并将其应用于3D人体姿势回归，结果表明SemGCN仅使用90％的参数就优于现有技术水平。

用于3D人体姿势回归的语义图卷积网络