Why I test the same datesets in different time shows different results?

[longfafffa]

Thanks for your good work. When I used your package to test the NIQE metric for the same file two weeks ago, the value was 20.21. However, now it is 3.67. How can I resolve this issue?

[chaofengc]

Thank for your information. Could you please provide the test images to reproduce the problem?