Solved by Brando_Miranda in post #7 
              
              
                I think you meant: 
train_dataset = MyDataset(train_transform)
val_dataset = MyDataset(val_transform)
train_indices, val_indices = sklearn.model_selection.train_test_split(indices)
train_dataset = torch.utils.data.Subset(train_dataset, train_indices)
val_dataset = torch.utils.data.Subset(val_dataset…