Well, on the basis of behavior of IBM Watson Services available on Bluemix Cloud, you can simply categories IBM Watson services as bellow;
Utility
- Speech-to-text
- Text-to-speech
- Document conversion
Non-Trainable
- Tone analyzer
- Personality Insights
Trainable: (User data)
- Conversation
- Natural language classifier
- Discovery
- Retrieve and rank
Trainable: (Enhanced Functionality)
- Natural language understanding
- Visual recognition
- Language translator
