Numba CUDA
CuPy covers array operations, and cp.RawKernel covers the case where you need a real kernel — but that kernel is a CUDA C++ string embedded in a Python file, with no syntax highlighting, no type checking, and no debugger. Numba takes the other route: you write the kernel in Python, decorated with @cuda.jit, and Numba compiles that Python function to PTX at first call.