Keyphrases
- relation extraction
- automatic extraction
- information extraction
- named entities
- semantic relations
- domain specific
- question answering
- semantic features
- dependency tree
- broad coverage
- semantic role labeling
- dependency trees
- named entity recognition
- reference resolution
- tree kernels
- knowledge representation
- key frames
- knowledge base
- named entity recognizer
- video data
- higher level
- higher order
- general purpose
- natural language processing
- knowledge discovery
- expert systems
- video sequences