transformers

34791613 - Fix type hint for train_dataset param of Trainer.__init__() to allow IterableDataset. Issue 29678 (#29738)

Fix type hint for train_dataset param of Trainer.__init__() to allow IterableDataset. Issue 29678 (#29738) * Fixed typehint for train_dataset param in Trainer.__init__(). Added IterableDataset option. * make fixup