langchain/cache.py/GPTCache/_get_gptcache
class GPTCache:    def _get_gptcache(self, llm_string: str) -> Any:
        """Get a cache object.

        When the corresponding llm model cache does not exist, it will be created."""

        return self.gptcache_dict.get(llm_string, self._new_gptcache(llm_string))