def hash_factory(seed):
if complex_types:
if universe_size is None:
fun = lambda x: hashfun(x, seed)
else:
fun = lambda x: hashfun(x, seed) % universe_size
else:
if universe_size is None:
fun = lambda x: hashfun(hashable(x), seed)
else:
fun = lambda x: hashfun(hashable(x), seed) % universe_size
return fun
def __init__(self, bit_depth=64, seed=0, hashfun_map=((64, chash64), (128, chash128))):
"""
:param bit_depth: Length of binary vector (bit resolution)
:type bit_depth: int
"""
self.bits = range(bit_depth)
self.seed = seed
for key_bits, val_fun in hashfun_map:
if bit_depth <= key_bits:
self.hashfun = lambda value, seed=0: val_fun(hashable(value), seed)
break
else:
self.hashfun = VarlenHash(bit_depth)
