ignis-numerics is GPU numerical computing for Ruby on the Ignis foundation: dense/sparse linear algebra, FFT (cuFFT), random number generation (cuRAND), linear solvers & decompositions (cuSOLVER), and Einstein-notation tensor contraction (cuTENSOR), with an nvmath-style API (Ignis.fft, Ignis.solve, Ignis.zeros, …). The lineage NvRuby began from, revived as a standalone gem.