bloom_filter
bloom_filter.py 源码
import mmh3
from bitarray import bitarray
# Bloom-Filter 实现
class BloomFilter:
def __init__(self, size, hash_num):
self.size = size
self.hash_num = hash_num
self.bit_array = bitarray(size)
self.bit_array.setall(0)
def add(self, val):
for seed in range(self.hash_num):
res = mmh3.hash(val, seed) % self.size
self.bit_array[res] = 1
def lookup(self, val):
for seed in range(self.hash_num):
res = mmh3.hash(val, seed) % self.size
if self.bit_array[res] == 0:
return "None"
return 'Probably'
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