Keyphrases
- context free grammars
- tree adjoining
- natural language
- context free
- visual languages
- syntactic pattern recognition
- phrase structure
- graph grammars
- tree bank
- natural language processing
- stochastic grammar
- parse tree
- grammar induction
- stochastic context free grammars
- grammatical inference
- hybrid approaches
- hybrid learning
- information retrieval
- data sets
- machine learning
- penn treebank
- natural language parsing
- unsupervised learning
- error recovery
- language understanding
- database
- regular expressions
- dependency parsing