Dependency tree to triplets

Question

I came across this paper http://swrc.kaist.ac.kr/paper/171.pdf, which describes a method to extract triplets from a dependency tree. This result is exactly I want. However the paper only mentioned it is a "post order tree traversal". Is there any open source implementation to extract triplets? For example, "VRLA is held at Los Angeles in 2016." should generate "VRLA, is held at, Los Angeles" and "VRLA, is held, in 2016"

Answer 1

You can try taking a look at the Stanford OpenIE system (part of CoreNLP):

new Sentence("VRLA is held at Los Angeles in 2016").openieTriples();

This should generate triples for (VRLA; be held at; Los Angeles) and (VRLA; be held in; 2016). More documentation on usage can be found on the OpenIE Annotator page. More generally, there are a number of OpenIE systems you can take a look at. Ollie is perhaps the most prominent, from the University of Washington.