cv2.imread(light_file + file_list[i]), cv2.COLOR_RGB2GRAY)

[GarveyHung]

Hi.

cv2.cvtColor(cv2.imread(light_file + file_list[i]), cv2.COLOR_RGB2GRAY) / 255.0

in syn_data.py

The format of the image read by cv2 is BGR.

So the code above should be:

cv2.cvtColor(cv2.imread(light_file + file_list[i]), cv2.COLOR_BGR2GRAY) / 255.0