public Map<String, IntermediateOperation> operations() {
        return operations;
    }
Holds an intermediate representation of an imported model graph.
After this intermediate representation is constructed, it is used to
simplify and optimize the computational graph and then converted into the
final ImportedModel that holds the Vespa ranking expressions for the model.

@author lesters
model-integration/src/main/java/ai/vespa/rankingexpression/importer/IntermediateGraph.java