Monarch Mixer: A Simple Sub-Quadratic GEMM-Based Architecture - Fu, Dan; Arora, Simran; Grogan, Jessica; Johnson, Isys; Eyuboglu, Evan Sabri; Thomas, Armin; Spector, Benjamin; Poli, Michael; Rudra, Atri; Ré, Christopher (Advances in Neural Information Processing Systems, 2023)