Open
Description
To add a custom feature extractor to the NER package, the path of least resistance is to modify NERFeatureFactory.java, AnnotationLookup.java, CoreAnnotations.java and SeqClassifierFlags.java. A more generic approach would use dependency injection, so third-party developers wouldn't have to touch code inside CoreNLP. If it's not already on your development roadmap, I'm happy to take on that change.
Dave