phyks/bloomysearch
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Commit before debugging bloom.py

Browse Source
This commit is contained in:
Phyks 2014-10-28 02:52:48 +01:00
parent b5cd1d9702
commit 679ac6a774
2 changed files with 25 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
index_generation/bloom.py
View File

@ -69,6 +69,7 @@ class BloomFilter():
r = self._locations
a = self.fnv_1a(v)
b = self.fnv_1a_b(a)
print(b)
i = 0
x = a % self.m
while i < self.k:
@ -114,44 +115,38 @@ class BloomFilter():
v = (v & 0x33333333) + ((v >> 2) & 0x33333333)
return ((v + (v >> 4) & 0xF0F0F0F) * 0x1010101) >> 24
def xor32bits(self, a, b):
# Cf https://stackoverflow.com/questions/1694507/difference-between-operator-in-js-and-python
m = (a ^ b) % (1 << 32)
if m > (1 << 16):
m -= 1 << 32
return m
def fnv_1a(self, v):
"""
Fowler/Noll/Vo hashing.
"""
n = len(v)
a = 2166136261
a = np.int32(2166136261)
i = 0
while i < n:
c = ord(v[i])
d = c & 0xff000000
c = np.int32(ord(v[i]))
d = np.int32(c) & np.int32(0xff000000)
if d:
a = self.xor32bits(a, d >> 24)
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24)
d = c & 0xff0000
a ^= np.int32(d >> 24)
a += np.int32((a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24))
d = c & np.int32(0xff0000)
if d:
a = self.xor32bits(a, d >> 16)
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24)
d = c & 0xff00
a ^= np.int32(d >> 16)
a += np.int32((a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24))
d = c & np.int32(0xff00)
if d:
a = self.xor32bits(a, d >> 8)
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24)
a = self.xor32bits(a, c & 0xff)
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24)
print(a << 24)
a ^= np.int32(d >> 8)
a += np.int32((a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24))
a ^= np.int32(c & 0xff)
a += np.int32((a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24))
print(a)
i += 1
# From http://home.comcast.net/~bretm/hash/6.html
a += a << 13
a = self.xor32bits(a, a >> 7)
a += a << 3
a = self.xor32bits(a, a >> 17)
a += a << 5
a += np.int32(a << 13)
a ^= np.int32(a >> 7)
a += np.int32(a << 3)
a ^= np.int32(a >> 17)
a += np.int32(a << 5)
print(a)
return a & 0xffffffff
def fnv_1a_b(self, a):
@ -160,8 +155,9 @@ class BloomFilter():
"""
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24)
a += a << 13
a = self.xor32bits(a, a >> 7)
a ^= a >> 7
a += a << 3
a = self.xor32bits(a, a >> 17)
a ^= a >> 17
a += a << 5
print(a)
return a & 0xffffffff

2
js/bloom.js
View File

@ -134,7 +134,7 @@
}
a ^= c & 0xff;
a += (a << 1) + (a << 4) + (a << 7) + (a << 8) + (a << 24);
console.log(a << 24)
console.log(a);
}
// From http://home.comcast.net/~bretm/hash/6.html
a += a << 13;