Keyphrases
- ad hoc retrieval
- short queries
- query expansion
- pseudo relevance feedback
- relevance model
- test collection
- retrieval effectiveness
- language model
- document retrieval
- document collections
- relevant documents
- information retrieval systems
- passage retrieval
- language modeling
- web search
- retrieved documents
- query terms
- relevance feedback
- information retrieval
- search tasks
- average precision
- context dependent
- image annotation
- web search engines