Keyphrases
- question classification
- label propagation
- question answering
- semi supervised
- semi supervised learning
- question answering systems
- class labels
- information retrieval
- community detection
- unlabeled data
- named entities
- labeled data
- natural language processing
- information extraction
- natural language
- spectral clustering
- active learning
- information retrieval systems
- feature weighting
- tree kernels
- learning algorithm