Skeleton-based Human Activity Recognition has achieved great interest in
recent years as skeleton data has demonstrated being robust to illumination
changes, body scales, dynamic camera views, and complex background. In
particular, Spatial-Temporal Graph Convolutional Networks (ST-GCN) demonstrated
to be effective in learning both spatial and temporal dependencies on
non-Euclidean data such as skeleton graphs. Nevertheless, an effective encoding
of the latent information underlying the 3D skeleton is still an open problem,
especially when it comes to extracting effective information from joint motion
patterns and their correlations. In this work, we propose a novel
Spatial-Temporal Transformer network (ST-TR) which models dependencies between
joints using the Transformer self-attention operator. In our ST-TR model, a
Spatial Self-Attention module (SSA) is used to understand intra-frame
interactions between different body parts, and a Temporal Self-Attention module
(TSA) to model inter-frame correlations. The two are combined in a two-stream
network, whose performance is evaluated on three large-scale datasets,
NTU-RGB+D 60, NTU-RGB+D 120, and Kinetics Skeleton 400, consistently improving
backbone results. Compared with methods that use the same input data, the
proposed ST-TR achieves state-of-the-art performance on all datasets when using
joints' coordinates as input, and results on-par with state-of-the-art when
adding bones information.

本文提出了一种基于 Spatial-Temporal Transformer 网络的骨骼姿态行为识别方法，使用自注意力机制成功提取了骨骼运动及其相关性的信息，与其他同类算法相比在多个大规模数据集上表现出更好的精度。