最近我学习了会话AI概念。我已经详细介绍了Dialogflow和Watson，但我需要了解一些事情，例如
1. Delivery models
2. Qualitative and quantitative metrics on delivery of conversational AI
3. Tools used for testing these Intelligent chat bots
4. Simulators or any other testing frameworks available
任何帮助将不胜感激：）