Semisupervised Learning Based Disease-Symptom and Symptom-Therapeutic Substance Relation Extraction from Biomedical Literature

Figure 2

Graph kernel with two directed subgraphs. The candidate interaction pair is marked as “ENTRY1” and “ENTRY2.” In the dependency based subgraph all nodes in a shortest path are specialized using a post-tag (IP). In the linear order subgraph possible tags are (B)efore, (M)iddle, and (A)fter.