《Two-Stream Adaptive Graph Convolutional Networks for Skeleton-Based Action Recognition》论文阅读笔记

本文介绍了一种新的骨骼识别模型——双流自适应图卷积网络(2s-AGCN),该模型通过BP算法统一学习图的拓扑结构,能够同时考虑骨骼的一阶和二阶信息,显著提升了识别精度。

提出问题:目前的GCN方法,图的拓扑结构都是手动设置的,固定在所有层和输入样本。此外,现有方法很少研究骨骼数据的二阶信息(骨骼的长度和方向)
本文提出:

  • Dual-stream adaptive graph convolutional network (2s-AGCN);
  • 模型中的图的拓扑结构可以由BP算法统一学习,也可以由BP算法以端到端的方式单独学习;
  • 对骨骼一阶和二阶信息建模,提高了识别精度。
### Skeleton-Based Action Recognition Using Adaptive Cross-Form Learning In the realm of skeleton-based action recognition, adaptive cross-form learning represents a sophisticated approach that integrates multiple modalities to enhance performance. This method leverages both spatial and temporal information from skeletal data while adapting dynamically across different forms or representations. The core concept involves constructing an end-to-end trainable framework where features extracted from joint coordinates are transformed into various intermediate representations such as graphs or sequences[^1]. These diverse forms capture distinct aspects of human motion patterns effectively: - **Graph Representation**: Models interactions between joints by treating them as nodes connected via edges representing bones. - **Sequence Modeling**: Treats each frame's pose estimation results as elements within time-series data suitable for recurrent neural networks (RNN). Adaptive mechanisms allow seamless switching among these forms based on their suitability at different stages during training/inference processes. Specifically designed modules learn when and how much weight should be assigned to specific transformations ensuring optimal utilization of available cues without overfitting any single modality. For implementation purposes, one might consider employing Graph Convolutional Networks (GCNs) alongside Long Short-Term Memory units (LSTMs). GCNs excel in capturing structural dependencies present within graph structures derived from skeletons; meanwhile LSTMs handle sequential modeling tasks efficiently handling long-range dependencies found along video frames' timelines. ```python import torch.nn as nn class AdaptiveCrossFormModule(nn.Module): def __init__(self): super(AdaptiveCrossFormModule, self).__init__() # Define components responsible for processing individual form types here def forward(self, input_data): # Implement logic determining which transformation path(s) will process 'input_data' pass def train_model(model, dataset_loader): criterion = nn.CrossEntropyLoss() optimizer = ... # Initialize appropriate optimization algorithm for epoch in range(num_epochs): running_loss = 0.0 for inputs, labels in dataset_loader: outputs = model(inputs) loss = criterion(outputs, labels) optimizer.zero_grad() loss.backward() optimizer.step() running_loss += loss.item() ```
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