Keyphrases
- document retrieval
- document collections
- language model
- information retrieval
- relevance feedback
- text retrieval
- spreading activation
- retrieval model
- cross language
- ranking functions
- learning to rank
- pseudo relevance feedback
- document indexing
- passage retrieval
- retrieved documents
- search engine
- inverted index
- language modeling
- relevant documents
- machine learning
- retrieval strategies
- learning algorithm
- web pages
- semantic mapping