Pytorch Dataset into FastAi loader

How do I pass in a torch dataset as in:

trainset = torchvision.datasets.CIFAR10(root='./data', train=True,
                                    download=True, transform=transform)
trainloader = torch.utils.data.DataLoader(trainset, batch_size=4,
                                      shuffle=True, num_workers=2)

either into :
data = ImageClassifierData.from_paths(PATH, tfms=tfms_from_model(arch, sz))

or directly in:

learn = ConvLearner.pretrained(arch, data, precompute=True) ?

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