I am not too familiar with CreateML but take a look at Lobe. It allows you to export models and it also comes with the option of using MobileNet (which is more

I am not too familiar with CreateML but take a look at Lobe. It allows you to export models and it also comes with the option of using MobileNet (which is more suitable for running on edge devices). You can also find examples on how to use the exported model on Lobe's Github.