Keyphrases
- pseudo relevance feedback
- xml retrieval
- document retrieval
- information retrieval systems
- query expansion
- retrieval effectiveness
- document collections
- relevant documents
- language model
- information retrieval
- test collection
- ad hoc retrieval
- relevance feedback
- retrieved documents
- retrieval model
- entity ranking
- language modelling
- query terms
- expansion terms
- retrieval systems
- text retrieval
- term selection
- average precision
- original query
- relevance model
- ranking functions
- language modeling
- xml elements
- learning to rank
- probabilistic model
- machine learning
- document clustering
- n gram
- ranked list