examples/pytorch/question-answering/trainer_seq2seq_qa.py/QuestionAnsweringSeq2SeqTrainer/__init__
class QuestionAnsweringSeq2SeqTrainer:    def __init__(self, *args, eval_examples=None, post_process_function=None, **kwargs):
        super().__init__(*args, **kwargs)
        self.eval_examples = eval_examples
        self.post_process_function = post_process_function