Keyphrases
- document retrieval
- news articles
- news corpus
- keyphrases
- statistical topic models
- information retrieval
- document collections
- online news
- retrieval model
- language model
- text documents
- news stories
- text retrieval
- relevance feedback
- relevant documents
- pseudo relevance feedback
- cross language
- named entities
- xml retrieval
- passage retrieval
- entity ranking
- news events
- query expansion
- query terms
- image classification
- digital libraries
- databases