I tried out the hello-world app and could not get it to work on an emulator or actual device (Huawei P20 Lite). However, the demo app works perfectly.
I tried setting up a test with my own model (for person re-identification) using a similar setup as on the demo app and I get an error as soon as I load my model:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pytorchmobile/com.example.pytorchmobile.MainActivity}: com.facebook.jni.CppException: false CHECK FAILED at ../c10/core/Backend.h (tensorTypeIdToBackend at ../c10/core/Backend.h:106)
    (no backtrace available)

This is also the case when I try importing the Super Resolution model from here: https://pytorch.org/tutorials/advanced/super_resolution_with_caffe2.html
Also, another question: is PyTorch mobile stable enough and suitable for production? Or should we just use ONNX and Caffe 2 until it is more mature?