Allen Bradley 1783-US08T ST-GCN：Spatial Temporal Graph Convolutional Networks時空圖卷積網絡，是在GCN的基礎上提出的。核心觀點是將TCN與GCN相結合，用來處理有時序關系的圖結構數據。網絡分為2個部分：GCN_Net與TCN_Net。
GCN_Net對輸入數據進行空間卷積，即不考慮時間的因素，卷積作用于同一時序的不同點的數據。TCN_Net對數據進行時序卷積，考慮不同時序同一特征點的關系，卷積作用于不同時序同一點的數據。
How：ST-GCN具體如何使用？
前部分講了ST-GCN是什么，那我們回歸到ST-GCN的具體應用上，提出ST-GCN是用來做人體動作識別，即通過一段視頻來判斷其中人的動作，也就是人體動作識別。
數據集：論文中使用的數據集為NTU-RGB+D，包含60種動作，共56880個樣本，其中有40類為日常行為動作，9類為與健康相關的動作，11類為雙人相互動作。數據集已經將視頻中的人體動作轉換為了骨架關節的數據，其中人體的骨架標注了25個節點，就是一種圖結構的數據。
NTU-RGB+D數據集的分類
亮點：
(1) 鄰接矩陣不采用傳統的方式，采用一種新的方式，將鄰接矩陣分為3個子集：根節點本身、向心力群，離心群。這一策略的靈感來自于身體部位的運動可以被廣泛地歸類為同心運動和偏心運動，通常距離越近，運動幅度越小，同時能更好地區分向心運動和離心運動。即下圖中的（d）。
(2) 網絡中加入可學習的邊的權重，即加入attention機制。每層網絡中鄰接矩陣A都與可學習的權重相乘，這些權重在反向傳播中更新。添加的原因是考慮到人體做不同的動作所側重的關節點不同，而且添加了注意力機制更有利于提高網絡的泛化能力。
整體效果：
使用ST-GCN的網絡結構進行人體動作識別，論文中在NTU-RGB+D數據集的x_sub模式下識別精度達到81.5%，NTU-RGB+D數據集的x-view模式下識別精度達到88.3%，優于傳統的人體動作識別網絡。
團隊工作亮點
ST-GCN的技術延展-動作生成
基于對ST-GCN在人體動作識別上的效果，我們將ST-GCN網絡與VAE網絡結合。目的在于獲取人體動作的語義，進而生成人體的動作，最終可以應用于機器人動作模仿或者其他強化學習項目中。
目前項目已在進行中，下圖展示的是真實的人體骨架節點3D圖與網絡生成的人體骨架節點3D圖。具體的研究結果，之后再跟大家分享，敬請期待。
Allen Bradley 1783-US08T
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