def default_chat_template(self):
        """
        A simple chat template that ignores role information and just concatenates messages with EOS tokens.
        """
        logger.warning_once(
            "\nNo chat template is defined for this tokenizer - using the default template "
            f"for the {self.__class__.__name__} class. If the default is not appropriate for "
            "your model, please set `tokenizer.chat_template` to an appropriate template. "
            "See https://huggingface.co/docs/transformers/main/chat_templating for more information.\n"
        )
        return "{% for message in messages %}" "{{ message.content }}{{ eos_token }}" "{% endfor %}"

        A simple chat template that ignores role information and just concatenates messages with EOS tokens.
        
dpkd/transformers/src/transformers/models/gpt2_parallel/tokenization_gpt2.py