libROM: libROM (C++ library for data-driven physical simulation methods) libROM: libROM: libROM: libROM is a free, lightweight, scalable C++ library for data-driven libROM: physical simulation methods. It is the main tool box that the reduced libROM: order modeling team at LLNL uses to develop efficient model order libROM: reduction techniques and physics-constrained data-driven methods. We libROM: try to collect any useful reduced order model routines, which are libROM: separable to the high-fidelity physics solvers, into libROM. libROM: libROM: