Keyphrases
- information extraction
- natural language processing
- precision and recall
- text mining
- named entities
- named entity recognition
- free text
- semi structured
- information retrieval
- machine learning
- unstructured text
- textual data
- text documents
- conditional random fields
- question answering
- web documents
- relation extraction
- ontology based information extraction
- relational learning
- open domain
- expert systems
- natural language text
- semantic tagging
- structured data
- data model
- knowledge base
- real world
- data extraction
- artificial intelligence
- information extraction systems
- extracting meaningful