Keyphrases
- information retrieval
- information retrieval systems
- learning to rank
- test collection
- document collections
- computational linguistics
- document retrieval
- retrieval systems
- question answering
- text mining
- query expansion
- language model
- knowledge discovery
- information systems
- relevance feedback
- neural network
- language modeling
- vector space model
- latent semantic indexing
- text processing
- databases