If you have a new(-ish) Macbook Air you could perhaps use an external (NVidia) graphics device like this:
external Thunderbolt PCIe case
Otherwise it will not be possible to run Cuda programms on non NVidia Hardware (since it is a proprietary framework)
You may also be able to run Cuda code through converting it to OpenCL first (for example with this framework: Swan Framwork )
