I studied a lot of forum posts on this topic, but I can not find a good answer. I can’t understand why at bacht 50, 100, 400 I get the same speed on one epoch. I value num_workers me, but was getting even more work time. I have one video card. I want to buy 2 or 4 video cards, but I don’t understand if I will have acceleration or not? What determines the speed of work? I have a lot of data and one era lasts 25 minutes, it is very long, I need to make 5000 eras at least.