Keyphrases
- relation extraction
- automatic extraction
- information extraction
- manually annotated
- biomedical literature
- semantic relations
- free text
- semantic network
- named entities
- domain specific
- dependency tree
- broad coverage
- semantic role labeling
- reference resolution
- question answering
- named entity recognition
- knowledge sources
- semantic features
- tree kernels
- dependency trees
- visual features
- wordnet
- natural language processing
- co occurrence
- general purpose
- text mining
- active learning
- object recognition
- high level
- knowledge base