This question is related to Count-distinct problem, There are many counter algorithms, in the case of the AMS counters which is quite similar with FlajoletMartin algorithm

How to design a data structure that includes multiple copies of the AMS estimator, each with its own independent hash function, to improve its accuracy, though at the cost of more space and higher running times. Could you present an example that how to improve the accuracy of the AMS counter, ( might invoke multiple copies of a basic cardinality estimator and then combine the estimates from those estimators into a single higher-quality estimate)

Ideally with general code