Keyphrases
- information extraction
- natural language processing
- precision and recall
- text processing
- question answering
- named entity recognition
- text mining
- web documents
- textual data
- free text
- open domain
- machine learning
- conditional random fields
- named entities
- special case
- semi structured
- structured data
- relational learning
- information retrieval
- extracting meaningful
- ontology based information extraction
- web mining
- machine translation
- hidden markov models
- relation extraction
- data extraction
- natural language
- data sets