Why do Bloom filters use multiple hash functions
Why do Bloom filters use multiple hash functions
Hash is conflict. Assuming that the Hash function is good, if our bit array length is m points, then if we want to reduce the collision rate to, say, 1%, this hash table can only hold mbank 100 elements. Obviously this is not called space efficiency (Space-efficient). The solution is also simple: use multiple Hash, if one of them says that the element is not in the collection, it is definitely not there. If they all say yes, although there is a possibility that they are lying, the probability of intuitively judging this kind of thing is relatively low.
-- excerpt from https://www.cnblogs.com/bonel.
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