Graph Neural Network. learning algorithm and applications. Shujia Zhang
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1 Graph Neural Network learning algorithm and applications Shujia Zhang
2 What is Deep Learning?
3 Enable computers to mimic human behaviour Artificial Intelligence Machine Learning Subset of ML algorithms using complex artificial neural networks F Deep Learning Subset of AI to make machine learn from data
4 Deep Learning Convolutional Graph Neural Network Neural Network (GNN) (CNN) Graph of Graphs (GoGs) Learning algorithm and applications
5 Data Representations Numeric: made of numbers Plain vector Sequences Trees Categorical: made of words Female 1 0 Male 0 1 Graph
6 Data Representations Plain vectors Sequences Trees Graph User events sequence
7 Data Representations Plain vectors Sequences Trees Graph
8 Data Representations Plain vectors Sequences Trees Graph
9 Graph of Graphs The nature of a node in a graph is of a more complicated structure than plain numeric vectors The node in a graph is described by another graph Theoretically, such structure can be extended to be with infinite depth Both the nodes and edges in the graph can be attached with labels
10 Web Spam Detection One-level GoGs Level 1: web documents connected via hyperlinks Documents are described by content-based and link-based feature vectors
11 Web Document Categorisation Three-level GoGs Level 1: web documents connected via hyperlinks Level 2: section of text within XML formatting elements Level 3: word tokens in section of text
12 Human Action Recognition
13 Step 2 Delaunay Triangulations Sequence of triangle graphs Step 1 Interest points Dense trajectories HOG, HOF, MBH
14 Human Action Recognition Two-level GoGs Level 1 Sequence of frames Level 2 Delaunay Triangulation of each frame u1 n1 u2 n2 u3 n3
15 How to encode GoGs structure using neural networks?
16 Graph Neural Network A graph is processed node by node sum of states in a random order Label For a node in graph, the sum of the state vectors of neighboring nodes hidden are computed and concatenated to its own label vector The algorithm guarantees a convergence of the state nodes to a stable and unique solution states outputs
17 Deep Graph Neural Network Encoding Network Encode Graph-of-Graphs The architecture of the sum of states Label hidden network depends on the depth and size of the graphs states Feedforward and backpropagation through graph structure and network output Output Network sum of states Label hidden structure states output
18 Iterative Feed Forward Initiate states for all nodes Compute sum of states of all neighboring nodes Feed forward through hidden to state layer Iterate the process until the states for all the nodes are stable
19 Iterative Feed Forward Initiate states for all nodes Compute sum of states of all neighboring nodes Feed forward through hidden to state layer Iterate the process until the states for all the nodes are stable
20 Iterative Back Propagation BP the error from the topmost level through the levels until we reach the deepest level of graph and update the parameters of the networks in the process Iterative BP iterates same number of times as the number of feed forwarding required to reach stable states
21 Deep Graph Neural Networks Compute the states: from the deepest level k of GoGs, to level k-1, k-2,..., 0 Compute outputs at the topmost level 0, and form an error function Back propagate the error and compute the gradients until we reach the deepest level k Update the network parameters and repeat the process
22 What are the applications of GNN and GoGs?
23 Web Spam Detection One-level GoGs for both properties of individual pages and relationship among pages Content-based and linked-based numeric feature vectors The GNN model produced AUC which outperformed others in the competition
24 Human Action Recognition Two-level GoGs Level 1 Sequence of frames Level 2 Delaunay Triangulation of each frame u1 n1 u2 n2 u3 n3
25 Human Action Recognition GoGs and GNN provide a deep learning based framework for human action recognition problem Different visual descriptors can be arranged in a spatial and temporal representation
26 Conclusion & Discussion The significance of the GoGs representation is that various features and structures from different depth in the problem domain are described without abstracting the intrinsic connections among them, and GNN is capable of encoding all the elements in a GoGs as a whole The problem still remains in such approach is that it is not easy to determine a good architecture, e.g. how many layers required? how many neurons in each layer? etc The computational cost can be high depends on depth of GoGs and structure of GNN
27 ? Q&A
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Exams ECS 189 WEB PROGRAMMING! If you are satisfied with your scores on the two midterms, you can skip the final! As soon as your Photobooth and midterm are graded, I can give you your course grade (so
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