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DNN with OpenCL for Nvidia on OpenCV-4.0

Hello everyone, I got the new OpenCV-4.0 and would like to know if DNN_TARGET_OPENCL would work with a Nvidia Graphic card? As far as I understood till OpenCV 3.4.2 only Intel graphic cards were supported. Has that changed? If yes, do I need to use UMat instead of Mat when passing images to the DNN? Thanks in advance.