transformers

122c2f81 - TF Model train and eval step metrics for seq2seq models. (#14009)

TF Model train and eval step metrics for seq2seq models. (#14009) * TF Model train and eval step metrics for seq2seq models. When using a model with a seq2seq output compute metrics against logits. * Removing vestigial code Co-authored-by: matt <rocketknight1@gmail.com>