Thanks for your help, I check the range of the labels, tensor(2), tensor(98), It looks like far beyond the range.
I implemented my Dataset like below:
train_transformations = transforms.Compose([
    transforms.RandomHorizontalFlip(),
    transforms.RandomCrop(32, padding=4),
    transforms.ToTensor(),
    transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))
])

data_train = datasets.CIFAR100(root="./data/", transform=train_transformations, train=True, download=True)

test_transformations = transforms.Compose([
    transforms.ToTensor(),
    transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))
])

data_test = datasets.CIFAR100(root="./data/", transform=test_transformations, train=False)
data_loader_train = torch.utils.data.DataLoader(dataset=data_train, batch_size=64, shuffle=True)
data_loader_test = torch.utils.data.DataLoader(dataset=data_test, batch_size=64, shuffle=True)

Thank you!