I extracted the espresso model files from a recent iOS build and then wrote a python script to unpack the weights and save them in an open source format that is easier to work with, in my case it was onnx. Through many rounds of iteration, I converted each neural network layer from espresso to its onnx equivalent and eventually got something that works, then turned it into an API. If you want me to send it to you, let me know! My GitHub username is the same username I have on here, and on my GitHub you’ll find my email.