Keyphrases
- free text
- relation extraction
- information extraction
- named entities
- entity extraction
- natural language processing
- coreference resolution
- named entity recognizer
- named entity recognition
- structured data
- text mining
- dependency trees
- natural language text
- machine learning
- natural language
- broad coverage
- information retrieval
- semi structured
- semantic relations
- conditional random fields
- question answering
- text documents
- tree kernels
- semantic role labeling
- information extraction systems
- medical records
- automatic extraction
- text processing
- web documents
- artificial intelligence
- data mining
- co occurrence
- feature space
- knowledge representation
- keywords
- clinical guidelines
- clustering algorithm
- knowledge base
- knowledge acquisition
- wordnet
- databases