Spatio-Temporal Slowfast Self-Attention Network For Action Recognition

We propose Spatio-Temporal SlowFast Self-Attention network for action recognition. Conventional Convolutional Neural Networks have the advantage of capturing the local area of the data. However, to understand a human action, it is appropriate to consider both human and the overall context of given scene. Therefore, we repurpose a self-attention mechanism from Self-Attention GAN (SAGAN) to our model for retrieving global semantic context when making action recognition. Using the self-attention mechanism, we propose a module that can extract four features in video information: spatial information, temporal information, slow action information, and fast action information. We train and test our network on the Atomic Visual Actions (AVA) dataset and show significant frame-AP improvements on 28 categories.