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libROM is a free, lightweight, scalable C++ library for data-driven physical simulation methods. It is the main tool box that the reduced order modeling team at LLNL uses to develop efficient model order reduction techniques and physics-constrained data-driven methods. We try to collect any useful reduced order model routines, which are separable to the high-fidelity physics solvers, into libROM. Plus, libROM is open source, so anyone is welcome to suggest new ideas or contribute to the development. Let's work together for better data-driven technology!

Features

Many more features will be available soon. Stay tuned!

libROM is used in many projects, including BLAST, ARDRA, Laghos, SU2, ALE3D and HyPar. Many MFEM-based ROM examples can be found in Examples.

See also our Gallery, Publications and News pages.

Recent News

Date Message
July 2, 2025 Podcast on defining foundation model is available
June 24-27, 2025 Kevin Chung presented LaSDI-IT at 54th International Annual Conference of the Fraunhofer ICT
June 19, 2025 Youngsoo Choi presented DD-FEM at Large-Scale Scientific Computations Conference
June 10-12, 2025 Youngsoo Choi led a breakout session at DOE ASCR Workshop on Inverse Methods for Complex Systems under Uncertainty
June 10, 2025 Parametric tLaSDI arXiv paper is available
June 10, 2025 mLaSDI arXiv paper is available
May 30, 2025 Defining Foundation Model arXiv paper is available
May 5, 2025 ROM for DED control paper is published in Additive Manufacturing

libROM tutorials in YouTube

Date Title
July 22, 2021 Poisson equation & its finite element discretization
Sep. 1, 2021 Poisson equation & its reduced order model
Sep. 23, 2021 Physics-informed sampling procedure for reduced order models
Sep. 11, 2022 Local reduced order models and interpolation-based parameterization
Sep. 23, 2022 Projection-based reduced order model for nonlinear system
Aug. 23, 2023 Complete derivation of dynamic mode decomposition

Latest Release

ExamplesCode documentationlibROM SourcespylibROM SourcesLaghosROM SourcesScaleupROMLaSDI SourcesgLaSDI SourcesGPLaSDI SourcesDD-NM-ROM SourcesNM-ROM SourcesWLaSDItLaSDIgappyAE

Documentation

Building libROMPoisson equationGreedy for Poisson

New users should start by examining the example codes and tutorials.

We also recommend using GLVis or VisIt for visualization.

Contact

Use the GitHub issue tracker to report bugs or post questions or comments. See the About page for citation information.