Why is cv2 required?

[ChunxuYang]

keytotext/keytotext/dataset.py

Line 1 in 6f807b9

from cv2 import randShuffle

I'm using this framework to generate text from knowlege graph. Python interpreter keeps throwing "cv2 not installed" exception. Looks like the pip package doesn't contains cv2 as dependancy. I tried to delete this line in source code, the model works well. Is this line necessary for this project? Concerning about adding opencv to pip package? Thanks for your concern.