Fig. 2

Visualization of meta path embedding vectors. Visualization of meta path embedding vectors using T-SNE [22]. The visualization result is very intuitive. Since the graph we created is an undirected one, the embeddings of paths are naturally symmetric. The lower-left group is meta paths which start from drug nodes and the upper-right group represent meta paths which start from disease nodes. Each point represents a meta path vector and different color represents different order of the relationships. For instance, point C on the left is a meta path of “Drug-Drug-Disease”, which represents the second order relationship that a drug might cure a disease that a similar drug can treat