Keyphrases
- passage retrieval
- question answering
- information retrieval
- question answering systems
- document retrieval
- free text
- text retrieval
- language model
- qa systems
- retrieval model
- query expansion
- audio visual
- text mining
- quantitative evaluation
- retrieval systems
- text documents
- information extraction
- active learning
- relevance model
- semantic information
- image understanding
- web documents
- high dimensional
- keywords
- search engine