Keyphrases
- black box
- question answering
- language model
- passage retrieval
- information retrieval
- language modeling
- document retrieval
- sentence retrieval
- cross language
- retrieval model
- n gram
- query expansion
- speech recognition
- probabilistic model
- question classification
- named entities
- natural language
- test collection
- pseudo relevance feedback
- information extraction
- test cases
- vector space model
- query terms
- natural language processing
- visual features
- semantic roles
- information retrieval systems
- training data
- text retrieval
- visual information
- semantic relatedness
- database systems
- answer extraction
- high level