transformers

6d2b2033 - Update `trainer._get_eval_sampler()` to support `group_by_length` arg (#33514)

Update `trainer._get_eval_sampler()` to support `group_by_length` arg (#33514) Update 'trainer._get_eval_sampler()' to support 'group_by_length' argument Trainer didn't support grouping by length for evaluation, which made evaluation slow with 'eval_batch_size'>1. Updated 'trainer._get_eval_sampler()' method was based off of 'trainer._get_train_sampler()'.