def create(cls, blob_key, **kwargs):
blob_key = blob_key
filename = kwargs.get('filename')
rows = kwargs.get('rows', 5)
bands = kwargs.get('bands', 40)
buckets_per_band = kwargs.get('buckets_per_band', 100)
shingle_type = kwargs.get('shingle_type', 'c4')
minhash_modulo = kwargs.get('minhash_modulo', 5000)
max_hashes = calculate_max_hashes(rows, bands)
dataset = cls.get(blob_key)
if not dataset:
dataset = BlobDataset(
filename = filename,
blob_key = blob_key,
random_seeds = get_random_bits(max_hashes),
rows = rows,
bands = bands,
buckets_per_band = buckets_per_band,
shingle_type = shingle_type,
minhash_modulo = minhash_modulo)
else:
dataset.filename = filename
return dataset.put()
def create(cls, blob_key, **kwargs):
blob_key = blob_key
filename = kwargs.get('filename')
rows = kwargs.get('rows', 5)
bands = kwargs.get('bands', 40)
buckets_per_band = kwargs.get('buckets_per_band', 100)
shingle_type = kwargs.get('shingle_type', 'c4')
minhash_modulo = kwargs.get('minhash_modulo', 5000)
max_hashes = calculate_max_hashes(rows, bands)
dataset = cls.get(blob_key)
if not dataset:
dataset = BlobDataset(filename=filename,
blob_key=blob_key,
random_seeds=get_random_bits(max_hashes),
rows=rows,
bands=bands,
buckets_per_band=buckets_per_band,
shingle_type=shingle_type,
minhash_modulo=minhash_modulo)
else:
dataset.filename = filename
return dataset.put()
def map(dataset, text, id=None):
logging.info("OpenLSH > map() called.")
start = datetime.datetime.utcnow()
hashes = calculate_max_hashes(dataset.rows, dataset.bands)
if len(dataset.random_seeds) < hashes:
dataset.random_seeds = get_random_bits(hashes)
dataset.put()
sh_type = dataset.shingle_type
modulo = dataset.minhash_modulo
seeds = list(dataset.random_seeds)
minhashes = calc_minhashes(text, sh_type, hashes, seeds, modulo)
buckets = []
buckets_per_band = dataset.buckets_per_band
for band in xrange(dataset.bands):
minhashes_in_band = [minhashes[band*dataset.rows + row] for row in xrange(dataset.rows)]
if len(set(minhashes_in_band)) <= 1:
buckets.append( (band * buckets_per_band) + hash(minhashes_in_band[0]) % buckets_per_band )
end = datetime.datetime.utcnow()
if 0 == (start.second % 20):
logging.info('id %s, length %d, time %d', id, len(text), int((end-start).total_seconds()))
for bkt in buckets:
yield (bkt, '/view/%s/%s' % (dataset.filename, id))
def map(dataset, text, id=None):
logging.info("OpenLSH > map() called.")
start = datetime.datetime.utcnow()
hashes = calculate_max_hashes(dataset.rows, dataset.bands)
if len(dataset.random_seeds) < hashes:
dataset.random_seeds = get_random_bits(hashes)
dataset.put()
sh_type = dataset.shingle_type
modulo = dataset.minhash_modulo
seeds = list(dataset.random_seeds)
minhashes = calc_minhashes(text, sh_type, hashes, seeds, modulo)
buckets = []
buckets_per_band = dataset.buckets_per_band
for band in xrange(dataset.bands):
minhashes_in_band = [
minhashes[band * dataset.rows + row]
for row in xrange(dataset.rows)
]
if len(set(minhashes_in_band)) <= 1:
buckets.append((band * buckets_per_band) +
hash(minhashes_in_band[0]) % buckets_per_band)
end = datetime.datetime.utcnow()
if 0 == (start.second % 20):
logging.info('id %s, length %d, time %d', id, len(text),
int((end - start).total_seconds()))
for bkt in buckets:
yield (bkt, '/view/%s/%s' % (dataset.filename, id))
