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utksi committed Jan 15, 2025
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## Detailed Analysis of Cooperative Graph Neural Networks (Co-GNNs)
## Cooperative Graph Neural Networks (Co-GNNs)

- Proposed by [Finkelstein et al.](https://arxiv.org/abs/2310.01267)

### **Framework Overview**

Co-GNNs introduce a novel, flexible message-passing mechanism where each node in the graph dynamically selects from the actions: `listen`, `broadcast`, `listen and broadcast`, or `isolate`. This is facilitated by two cooperating networks:

1. **Action Network \(\pi\)**: Determines the optimal action for each node.
2. **Environment Network \(\eta\)**: Updates the node states based on the chosen actions.
1. **Action Network \( \pi \)**: Determines the optimal action for each node.
2. **Environment Network \( \eta \)**: Updates the node states based on the chosen actions.

## **Mathematical Formulation**

1. **Action Selection (Action Network \(\pi\))**:
1. **Action Selection (Action Network \( \pi \))**:

- For each node \(v\), the action network predicts a probability distribution \(p^{(\ell)}_v\) over the actions \(\{S, L, B, I\}\) at layer \(\ell\):

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