Keyphrases
- positive and negative
- wordnet
- sentiment analysis
- product features
- opinion mining
- sentiment classification
- positive or negative
- opinion words
- product reviews
- customer reviews
- polarity classification
- knowledge base
- semantic analysis
- semantic information
- semantic features
- databases
- word sense disambiguation
- co occurrence
- text classification
- natural language processing
- keywords
- domain specific
- automatically extracting
- opinion retrieval
- user comments
- sentiment lexicon
- highly ambiguous
- online product reviews
- sentiment polarity
- decision trees
- information retrieval and extraction