PyTorch to CoreML: Writing custom layers with Metal

cd Convert python3 -m pip install -r requirements.txt python3 convert.py -o /path/to/output/resulting/mlmodel/file 

Open TorchCoreMLDemo.xcodeproj in Xcode, build and run the app.

The code of the grid sample Metal-shader is here.

More information about grid sample (warper) algorithm you can find here.