Keyphrases
- relation extraction
- information extraction
- automatic extraction
- semantic relations
- domain specific
- semantic role labeling
- named entities
- natural language
- question answering
- dependency trees
- broad coverage
- semantic features
- named entity recognition
- dependency tree
- tree kernels
- low level
- unsupervised learning
- natural language processing
- hidden markov models
- information retrieval
- machine learning
- data mining