def test_simhash128_3(self):
sh = SimHashSignature(128)
str1 = "♡♥❤❥"
str2 = u"♡♥❤❥"
sig5 = sh.get_signature(str1)
sig6 = sh.get_signature(str2)
self.assertNotEqual(sig5, sig6)
def test_simhash_feature_weights(self):
"""Features should be weighted and should contribute to
similarity/distance
"""
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracdabra")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 6)
sig1 = sh.get_signature("abracadabra", ("cats", 0))
sig2 = sh.get_signature("abracdabra", ("dogs", 0))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 6)
sig1 = sh.get_signature("abracadabra", ("cats", 0))
sig2 = sh.get_signature("abracadabra", ("dogs", 0))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
sig1 = sh.get_signature("abracadabra", ("ca", 4))
sig2 = sh.get_signature("abracadabra", ("do", 4))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
sig1 = sh.get_signature("abracadabra", ("ca", 5))
sig2 = sh.get_signature("abracadabra", ("do", 5))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 7)
sig1 = sh.get_signature("abracadabra", ("cats", 200))
sig2 = sh.get_signature("abracadabra", ("dogs", 200))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 17)
sig1 = sh.get_signature("abracadabra", ("cats", 10))
sig2 = sh.get_signature("abracadabra", ("cats", 10))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
def test_simhash_similarity(self):
"""Signatures should be consistent"""
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracadabra")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("arbcd")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 13)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 32)
def test_simhash64(self):
"""Simhash signature of an empty string should be zero and unicode and
regular strings should give the same simhash signatures
"""
sh = SimHashSignature(64)
sig1 = sh.get_signature("")
sig2 = sh.get_signature(u"")
self.assertEqual(sig1, sig2)
sig3 = sh.get_signature("abracadabra")
sig4 = sh.get_signature(u"abracadabra")
self.assertEqual(sig3, sig4)
str1 = "♡♥❤❥"
str2 = u"♡♥❤❥"
sig5 = sh.get_signature(str1)
sig6 = sh.get_signature(str2)
self.assertNotEqual(sig5, sig6)
def test_simhash_similarity(self):
"""Signatures should be consistent"""
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 25)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracadabra")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracdabra")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 6)
def test_simhash128(self):
"""Simhash signature of an empty string should be zero
and unicode and regular strings should give the same
simhash signatures
"""
sh = SimHashSignature(128)
sig1 = sh.get_signature("")
sig2 = sh.get_signature(u"")
self.assertEqual(sig1, 0)
self.assertEqual(sig1, sig2)
sig3 = sh.get_signature("abracadabra")
sig4 = sh.get_signature(u"abracadabra")
self.assertEqual(sig3, sig4)
str1 = "♡♥❤❥"
str2 = u"♡♥❤❥"
sig5 = sh.get_signature(str1)
sig6 = sh.get_signature(str2)
self.assertNotEqual(sig5, sig6)
def __init__(self,
cfg,
content_filter=None,
trace_every=0,
get_body=None,
get_label=None,
get_prefix=None,
min_support=None,
seed=0,
normalizer=None,
tokenizer=None):
"""Read configuration"""
self.cfg = cfg
self._get_body = get_body
self._get_label = get_label
self._get_prefix = get_prefix
self.trace_every = trace_every
# Set options
self.content_filter = content_filter
self.min_support = cfg[
'min_support'] if min_support is None else min_support
# normalizer and tokenizer
self.normalizer = get_default_normalizer(
**cfg.get('preprocessor', {}).get('normalizer', {})) \
if normalizer is None else normalizer
self.tokenizer = get_default_tokenizer(
) if tokenizer is None else tokenizer
# Configure minhash signer
sig_width = cfg['sig_width']
lsh_hasher = LSHC(width=sig_width, **cfg['lsh_options'])
self.signer = MinHashSignature(sig_width,
lsh_hasher=lsh_hasher,
kmin=cfg['kmin'])
# Configure shingler
cfg_key_shingle = cfg['shingler']
self.shingler = get_default_shingler(**cfg_key_shingle)
# Configure sketch comparison algorithm
cfg_sketch = cfg['sketch']
self.sketch_enabled = cfg_sketch['enabled']
self.sketch_dist_fn = None
self.max_dist = None
if self.sketch_enabled:
algorithm_name = cfg_sketch['algorithm']
try:
sketch_algorithm = getattr(SketchModel, algorithm_name)
except AttributeError:
raise RuntimeError("Unknown sketch model specified: '%s'" %
algorithm_name)
self.sketch_bits = cfg_sketch['size']
cfg_sketch_shingler = cfg_sketch['shingler']
if not cfg_sketch_shingler['enabled']:
# if sketch shingler is disabled, we also disable signer
# as we will use default signer
self.sketch_shingler = None
self.sketch_signer = None
elif sketch_algorithm == SketchModel.simhash:
del cfg_sketch_shingler['enabled']
self.sketch_shingler = Shingler(**cfg_sketch_shingler)
self.sketch_signer = SimHashSignature(self.sketch_bits,
seed=seed)
elif sketch_algorithm == SketchModel.minhash:
del cfg_sketch_shingler['enabled']
self.sketch_shingler = Shingler(**cfg_sketch_shingler)
self.sketch_signer = MinHashSketchSignature(self.sketch_bits,
seed=seed)
self.sketch_shingler._tokenizer = None
self.sketch_shingler._normalizer = None
self.max_dist = \
int(floor(self.sketch_bits *
(1.0 - float(cfg_sketch['resemblance']))))
self.sketch_dist_fn = hamming
self.sketch_operator = OPERATOR_MAP[cfg_sketch.get(
'operator', 'and')]
self.cluster_builder = Cluster(sketch_dist_fn=self.sketch_dist_fn,
max_dist=self.max_dist,
min_support=self.min_support,
sketch_operator=self.sketch_operator)
def test_simhash_feature_weights(self):
"""Features should be weighted and should contribute to
similarity/distance
"""
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracdabra")
dist = hamming(sig1, sig2)
self.assertEqual(dist, 3)
sig1 = sh.get_signature("abracadabra", ("cats", 0))
sig2 = sh.get_signature("abracdabra", ("dogs", 0))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 3)
sig1 = sh.get_signature("abracadabra", ("cats", 0))
sig2 = sh.get_signature("abracadabra", ("dogs", 0))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
sig1 = sh.get_signature("abracadabra", ("ca", 4))
sig2 = sh.get_signature("abracadabra", ("do", 4))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 9)
sig1 = sh.get_signature("abracadabra", ("ca", 5))
sig2 = sh.get_signature("abracadabra", ("do", 5))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 9)
sig1 = sh.get_signature("abracadabra", ("cats", 200))
sig2 = sh.get_signature("abracadabra", ("dogs", 200))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 21)
sig1 = sh.get_signature("abracadabra", ("cats", 10))
sig2 = sh.get_signature("abracadabra", ("cats", 10))
dist = hamming(sig1, sig2)
self.assertEqual(dist, 0)
def test_simhash_similarity_3(self):
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("")
dist = hamming(sig1, sig2)
self.assertEqual(37, dist)
def test_simhash128_2(self):
sh = SimHashSignature(128)
sig3 = sh.get_signature("abracadabra")
sig4 = sh.get_signature(u"abracadabra")
self.assertEqual(sig3, sig4)
def test_simhash128_1(self):
sh = SimHashSignature(128)
sig1 = sh.get_signature("")
sig2 = sh.get_signature(u"")
self.assertEqual(0, sig1)
self.assertEqual(sig1, sig2)
def test_simhash64_1(self):
sh = SimHashSignature(64)
sig1 = sh.get_signature("")
sig2 = sh.get_signature(u"")
self.assertEqual(sig1, sig2)
def test_simhash_feature_weights_7(self):
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra", ("cats", 10))
sig2 = sh.get_signature("abracadabra", ("cats", 10))
dist = hamming(sig1, sig2)
self.assertEqual(0, dist)
def test_simhash_feature_weights_1(self):
sh = SimHashSignature(64)
sig1 = sh.get_signature("abracadabra")
sig2 = sh.get_signature("abracdabra")
dist = hamming(sig1, sig2)
self.assertEqual(3, dist)
