Keyphrases
- named entity recognition
- named entities
- information extraction
- natural language processing
- text summarization
- relation extraction
- maximum entropy
- hand coded
- annotated corpus
- text mining
- co occurrence
- question answering
- conditional random fields
- sequence labeling
- semi supervised
- classifier ensemble
- proper names
- chinese named entity recognition
- social media
- natural language
- maximum entropy classifier
- data sets