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Using DIS dense optical flow in conda OpenCV 3.4

Hello OpenCV community, I am working on an application where speed performance is a critical parameter and I found out that the Dense Optical Flow I am using is causing the biggest slow-down in the processing. I found further out that OpenCV 4 implements Dense Inverse Search Optical Flow which is supposed to be faster and I have some hopes on it. I was wondering if there is any way I can use DIS in the Python opencv 3.4 ran in Anaconda Spyder? If so, what are the steps shall I take? (I am not good with linking libraries and sorting out dependencies manually)

Besides, do you plan on releasing OpenCV 4 for Anaconda, if so - when? Do you plan adding the gpu-accelerated open cv to Anaconda, too?

Thank you in advance, Konstantin