Method copy_prompt_state

examples/server/server.py:12676–12682

(
        self,
        source_sequence_id: int,
        dest_sequence_id: int,
        keep_len: int,
    )

    @abc.abstractmethod
    def copy_prompt_state(
        self,
        source_sequence_id: int,
        dest_sequence_id: int,
        keep_len: int,
    ) -> None:
        raise NotImplementedError


class AttentionMemoryPolicy(MemoryPolicy):