Anaconda Enterprise: Documentation

# 3.4. Writing Device Functions

CUDA device functions can only be invoked from within the device (by a kernel or another device function). To define a device function:

    from numba import cuda

    @cuda.jit(device=True)
    def a_device_function(a, b):
        return a + b

Unlike a kernel function, a device function can return a value like normal functions.