NIER is a graph (V,E) where V is the set of vertices (nodes) and E is the set of edges (connections between nodes). Nodes contains the following informations:
unique id
name coming from the original model, if it exists
shape of the tensor resulting from the application of the node operation, if it exist
operation performed
parameters of the operation
an optional tensor storing the data
Note that tensor have their own shape; they must be equal to the NIER's node shape however.