Explainability

explainability is still on going work. Also fairness and others. Explainable means that the a system itself, not the human being, needs to be able to explain to a human being why he is making that recommendation. So that's not that easy, especially when you are using some of the most successful approaches, which are based on data and machine learning and deep learning. Another challenge is that, e you may have to provide different expla explanations for different users.