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torch.utils.data.Dataloder with num_workers=4, get stuck, why?

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here is the code dt = VideoIter(config.NTU, config.test_set, sampler=None, gpu_id=7) dl = data.DataLoader(dt, 128, num_workers=4) but, when num_workers=0, this code woks fine.

I am new to video classification and trying to reproduce MF-net's results。While i am stuck in download the kinetics-400 dataset, it would be a great help if anyone willing to...