Lemma form of a word; relative position to the pair of proteins (before, middle, after); frequency in the sentence
Shortest path level
Vertex walks in the shortest path; edge walks in the shortest path; subsets of walks on the target pair in a parse structure
Graph level
Graph matrices based on a parse structure subgraph and linear order subgraph from the dependency parsers. The graph features are all the nonzero elements in the graph matrices
