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from abc import abstractmethod
from rag.generator.prompt import Prompt
class AbstractReranker(type):
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
instance = super().__call__(*args, **kwargs)
cls._instances[cls] = instance
return cls._instances[cls]
@abstractmethod
def rank(self, prompt: Prompt) -> Prompt:
return prompt
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