AI has become a hot topic among tech corporations, startups, investors, the media, and the public. That's only because machine learning platforms have already been doing hard work for years now. Last month, NVIDIA announced the addition of Huawei and Alibaba as adopters of its system "Metropolis", an AI-platform for smart cities. More than 50 organizations are already using Metropolis and, by 2020, according to NVIDIA, there will be 1 billion video cameras worldwide that could be connected to AI platforms to make cities smarter. When connected to AI, cameras can be used to recognize shapes, faces and even the emotions of individuals, which has varied applications: autonomous cars, video surveillance (traffic flow, crime monitoring), and consumer behavior analysis (reaction to ads for example).