Keyphrases
- discriminative models
- information retrieval
- language modeling
- generative model
- semi supervised learning
- probabilistic boosting tree
- language model
- discriminative learning
- information extraction
- probabilistic model
- information retrieval systems
- text mining
- search engine
- retrieval model
- conditional random fields
- test collection
- document retrieval
- training data
- relevant documents
- machine learning
- data sets