Flashlight is a fast, flexible machine learning library written entirely in C++ from the Facebook AI Research and the creators of Torch, TensorFlow, Eigen and Deep Speech. Its core features include: * Total internal modifiability including internal APIs for tensor computation. * A small footprint, with the core clocking in at under 10 MB and 20k lines of C++. * High-performance defaults featuring just-in-time kernel compilation with modern C++ via the ArrayFire tensor library. * An emphasis on efficiency and scale.