Caffe2 is a lightweight, modular, and scalable deep learning framework refactored from the previous Caffe. Caffe2 has been widely used at Facebook to enable new AI & AR experiences. This talk will be divided into two parts. In the first part, we will explain some framework basics, the strengths of Caffe2, large scale training support and will walk you through several product use-cases at Facebook including computer vision, machine translation, speech recognition and content ranking. The second part will explain how users benefit from Caffe2''s built-in neural network model compression, fast convolution for mobile CPUs, and GPU acceleration.