Why doesn't the model change in ESRGAN?

Question

Python

I am writing a model "1x_JPEG_00-20.pth" and using "Model path models/RRDB_ESRGAN_x4.pth.".

Answer 1

Because the path to the file is hardwired inside the script : To make it possible to pass it as a parameter, you need to change it like this:
model_path = 'models/RRDB_ESRGAN_x4.pth'

import sys
model_path = sys.argv[1]

And you should still learn the language you use, and not try to run anything in the hope of success. I'm not sure that this test script is designed for an arbitrary model, and not just for the specified one.