Keyphrases
- text summarization
- named entity recognition
- natural language processing
- multi document summarization
- information extraction
- question answering
- automatic text summarization
- automatic summarization
- query expansion
- extractive summarization
- temporal expressions
- search engine
- text segments
- named entities
- maximum likelihood
- document structure
- higher order
- keyword extraction
- training set
- arabic language
- machine learning