Why using the GPU can not display the output window, but the CPU can?

[jianyuheng]

I use the MOT test video, when I let FLAGS.gpu = 0, the program can output the normal display window, and save the video. But when I use the GPU（FLAGS.gpu = 0.8）, the program works without any output (without any warning or error), does not output a display window but saves a video file with no content. Thank you for taking the time to help me solve the problem.

System：Win10
GPU：1050TI
CUDA： cuda_8.0.61
cudnn：cudnn v6.0