Keyphrases
- passage retrieval
- question answering
- document retrieval
- language model
- query expansion
- audio visual
- information retrieval
- retrieval model
- relevance model
- quantitative evaluation
- semantic relatedness
- retrieval systems
- probabilistic model
- pseudo relevance feedback
- wordnet
- free text
- document collections
- test collection
- artificial intelligence
- bayesian networks
- co occurrence
- natural language processing
- domain knowledge
- digital libraries