Keyphrases
- language model
- open domain
- language modeling
- information extraction
- document retrieval
- n gram
- probabilistic model
- language modelling
- query expansion
- question answering systems
- information retrieval
- retrieval model
- question answering
- test collection
- query terms
- statistical language models
- vector space model
- pseudo relevance feedback
- document ranking
- smoothing methods
- translation model
- language models for information retrieval