'Seq2SeqTrainingArguments' object has no attribute 'do_semi_train'

Hello, when I run run_summarization.py, I get the following error:
Traceback (most recent call last):
File "run_summarization.py", line 703, in
main()
File "run_summarization.py", line 462, in main
if training_args.do_train and not training_args.do_semi_train:
AttributeError: 'Seq2SeqTrainingArguments' object has no attribute 'do_semi_train'