Keyphrases
- query terms
- language model
- query expansion
- co occurrence
- retrieval effectiveness
- information retrieval systems
- document retrieval
- user queries
- relevant documents
- information retrieval
- document collections
- cross language information retrieval
- query logs
- retrieval model
- verbose queries
- proper names
- related concepts
- search queries
- semantically related
- term frequency
- pseudo relevance feedback
- retrieved documents
- search terms
- noun phrases
- term weighting
- databases
- test collection
- search engine
- probabilistic model
- anchor text
- machine learning
- high dimensional
- knn