def get_host_for_key(self, key):
        raise NotImplementedError()
Compute distance of two vector by pearson distance
dataset/ETHPy150Open fengsp/rc/rc/redis_router.py/BaseRedisRouter.get_host_for_key--crossover with--dataset/ETHPy150Open jasonwbw/DensityPeakCluster/distance/distance.py/PearsonDistance.distance