Cannot read IWSLT dataset

[erlebach]

Hi,

The following code does not execute: """ train_data, valid_data, test_data = datasets.IWSLT.splits( exts=('.de', '.en'), fields=(SRC, TRG), filter_pred=lambda x: len(vars(x)['src']) <= MAX_LEN and len(vars(x)['trg']) <= MAX_LEN """ What should I replace this code with? Thanks for a great code base.