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GNN Specification

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GNN Source File Structure

The describes the Markdown-like structure of the plaintext source file of GNN (sometimes the file is called .S, though the exact ending is unimportant).
GNN source file structure
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GNN Section
Section Meaning
Controlled Terms
1
Image from paper
Shows the image of the graphical model, if one exists.
2
GNN version and flags
Describes which specification of LanGauge is being used.
3
Model name
Gives a name for the model being expressed.
4
Model annotation
Plaintext caption or annotation for the model. This is a free metadata field which does not need to use any formal or controlled language.
5
State space block
Describes all variables in the model, and their state space (dimensionality).
6
Connections
Describes edges among variables in the graphical model.
7
Initial parameterization
Provides the initial parameter values for variables.
8
Equations
Describes any equations associated with the model, written in LaTeX. These equations are at least rendered for display, and further can actually specify relationships among variables.
9
Time
Describes the model’s treatment of Time.
“Static” → Is a static model. “Dynamic” → Is a dynamic model. DiscreteTime=X_t → Specifies X_t as the temporal variable in a discrete time model. ContinuousTime=X_t → Specifies X_t as the temporal variable in a continuous time model. ModelTimeHorizon=X → Specifies X as the time horizon for finite-time modeling.
10
ActInf Ontology annotation
Connects the variables to their associated Active Inference Ontology term, for display and model juxtaposition.
Variables in this section are associated with one or more terms from the Active Inference Ontology. For example “C=Preference” means that the C variable plays the role of the Preference variable.
11
Footer
Closes the file and allows read-in from either end.
12
Signature
Cryptographic signature block (can have information regarding the completeness or provenance of the source file).
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