cuPeriod: GPU-Accelerated Periodograms for Time-Domain Astronomy

cuPeriod computes period-search statistics for variable stars and transiting systems with fast CPU backends and GPU-accelerated paths that scale from a single light curve to millions. The NVIDIA CUDA fast paths are joined by a portable PyTorch backend that also runs on AMD, Intel, and Apple GPUs (and a CPU-only path), so the accelerated code is no longer NVIDIA-only. One API, one CLI, and an optional desktop GUI cover every method, with frictionless column handling, multi-band support, raw-spectrum output, and an N-best-periods utility.