Keyphrases
- language model
- pseudo relevance feedback
- relevance model
- retrieved documents
- document ranking
- test collection
- query expansion
- language modeling
- language modelling
- document retrieval
- information retrieval
- trec collections
- n gram
- probabilistic model
- ad hoc retrieval
- pseudo feedback
- retrieval effectiveness
- retrieval model
- retrieval accuracy
- clustering algorithm
- ad hoc information retrieval
- trec test collections
- k means
- query terms
- document length
- clustering method
- original query
- relevant documents
- relevance feedback
- query specific
- text retrieval
- smoothing methods
- average precision
- natural language
- expert search
- document clustering
- information retrieval systems
- query topic
- translation model
- document representation
- feature selection