AGENTS.md@src/gnn/gnn_examples git:20260410.cc768d5A

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# GNN Examples Module

## Purpose

This module contains **reference GNN model files** that serve as both documentation and test fixtures. The primary example is a complete Active Inference POMDP agent specification.

## Example Files

| File | Description |
|------|-------------|
| `actinf_pomdp_agent.md` | Complete GNN specification for a discrete POMDP Active Inference agent with 4 hidden states, 5 observations, 3 control states, and full parameterization |

## Key Sections in the POMDP Example

The reference file demonstrates all required GNN sections:

- **StateSpaceBlock**: Defines hidden states (s), observations (o), and control states (u) with dimensionality annotations
- **Connections**: Maps state-observation relationships using GNN edge notation (`->`, `<->`)
- **InitialParameterization**: Provides matrices A, B, C, D with full numeric values
- **Equations**: Active Inference update equations (variational free energy, posterior, expected free energy)
- **Time**: Dynamic/discrete temporal configuration

## For AI Agents

1. **Use as reference** when parsing or generating GNN files — this is the canonical example
2. **Use for testing** — reference model for round-trip tests configured in [`../testing/test_round_trip.py`](../testing/test_round_trip.py); scope vs all **23** `GNNFormat` values is defined in [`../SPEC.md`](../SPEC.md)
3. **Model structure**: The POMDP agent demonstrates proper Active Inference variable naming (A=likelihood, B=transition, C=preference, D=prior, E=policy prior)