RASA

RASA is an open source platform to develop conversational ai agents a.k.a. chatbots. With RASA, we can develop simple chit-chat bots to complex business bots which can perform business logic on behalf of the user.

RASA is a classic amalgamation of Conversational AI ( particularly NLU ) and, Software and System Design skills.

Under the hood, the user facing component is state of the art DIET ( Dual Intent Entity Transformer ) Classifier, with a cool well laid system forming the backend

Natural Language Understanding:
In simple terms, the way we understand what the user is trying to convey using machine learning. The complete pipeline right from the basics of tokenization . . . to deep learning layers . . . ending with softmax to identify the intent of the user

Conversational AI is lot broader than NLU and can be broadly categorized as shown in the pie chart