Keyphrases
- text representation
- information filtering
- concept learning
- text classification
- text documents
- text categorization
- vector space model
- document clustering
- index terms
- text retrieval
- bag of words
- document representation
- keywords
- semi supervised
- text mining
- information extraction
- probabilistic model
- text clustering
- question answering
- representation scheme
- search engine
- user profiles
- document collections
- recommender systems
- feature extraction
- feature selection