src/transformers/pipelines/conversational.py/Conversation/mark_processed
class Conversation:    def mark_processed(self):
        """
        Mark the conversation as processed (moves the content of `new_user_input` to `past_user_inputs`) and empties
        the `new_user_input` field.
        """
        if self.new_user_input:
            self.past_user_inputs.append(self.new_user_input)
        self.new_user_input = None