please help me, the value of loss does not decrease

[Utopiaaaaaaa]

I follow the tutorial completely，and I had train 7 hours，but the result is not successful, the training parameters such as above picture.
PS:because the package version is different (opencv-python=4.1.0.25, numpy=1.16.4 and tensorflow-gpu=1.8.0 ),I modified line 128 and line 139, I'm not sure the modify is right.

[JinyangMarkLiu]

Hi, did you solve this problem, I met the same issue as you did.