Qt+libtorch+opencv，image classifier.
1.QtTorch uses CMakelist.txt to config, you need to be familiar with CMakelist.txt.
2.QtTorchPro uses qmake and pro to config, it's very easy to use. I recommend using this.
Qt5.12, linux-libtorch(1.3), opencv3.4.2
1.Export the model file by pytorch_export.py first
2.Modify file path in main.cpp
