Keyphrases
- relation extraction
- automatic extraction
- information extraction
- domain specific
- named entities
- semantic relations
- semantic role labeling
- question answering
- dependency tree
- reference resolution
- named entity recognition
- dependency trees
- semantic features
- broad coverage
- tree kernels
- parse tree
- named entity recognizer
- maximum entropy
- conditional random fields
- co occurrence
- domain knowledge
- feature selection