Fig. 4
Construction of KG. (A) Illustration of the meta-graph (schema) of the KG, defining the overall structure and relationships between different entity types. Rectangular nodes represent six distinct entity categories, while directed edges (arrows) indicate possible relationships between entities, with edge labels specifying the relationship types. For instance, a directed edge from the ‘patient’ entity to the ‘disease’ entity with the label “suffers” represents the fact triple (patient, suffers, disease) in the KG. The schema comprises seven unique relationship types that govern how different entities can be connected in the knowledge base. (B) Display of some entities and relationships in the “MDD” disease category. Dots represent entities, different entity types are indicated by different colors, and the names of the entities are written on the dots. Arrows represent relationships. (C,D) Examples of partial KG structural network. Figure (C) shows a partial network of nodes related to symptom-disease pairs, and Figure (D) shows a partial network of nodes related to drug-disease pairs. The complex relationships within the KG form a vast network structure of psychosomatic disorder knowledge.
