software SuperLU_DIST Communication-Avoiding 3D Sparse Direct Solver ArborX Performance-Portable Spatial Search and Clustering research Sparsitute DOE Mathematical Institute for Sparse Computations (2022-2027) Tensor Factorization & NMF Scalable Non-negative and Constrained Tensor Decomposition Matrix Functions & Numerical Methods Algorithms for Log-Determinants, Neumann Series, and Matrix Approximation Knowledge Graph Analytics Exascale Graph Algorithms for Biomedical Discovery Fault-Tolerant Algorithms Self-Stabilizing Algorithms for Resilient HPC Communication-Efficient HPC Cross-Cutting Optimization for Distributed Computing