This will be a technical talk where I'll explain the inner workings of the machine learning algorithms inside of Rasa. In particular I'll talk about why the transformer has become a part in many of our algorithms and has replaced RNNs. These include use-cases in natural language processing but also in dialogue handling. You'll see a live demo of a typical error that an LSTM would make but a transformer wouldn't. The algorithms are explained with calm diagrams and very little maths.