def get_similar_sentences(query):
embeddings = load_embeddings()
sentence_ids = load_sentence_ids()
index = AnnoyIndex(get_embeddings_dim(embeddings), "angular")
index.load("index.ann")
print("Found {} items in the index.".format(index.get_n_items()))
print("The index uses {} trees.".format(index.get_n_trees()))
print("")
closest, dists = index.get_nns_by_vector(
embeddings[query], 10, include_distances=True) # noqa: E501
assert (len(closest) == len(dists))
closest = map(lambda sid: sentence_ids[sid], closest)
return zip(closest, dists)
def annotate_all_questions():
embeddings = load_embeddings()
sentence_ids = load_sentence_ids()
index = AnnoyIndex(get_embeddings_dim(embeddings), "angular")
index.load("index.ann")
print("Found {} items in the index.".format(index.get_n_items()))
print("The index uses {} trees.".format(index.get_n_trees()))
print("")
df = pd.concat(map(dm.ALLEN_AI_OBQA, list(OBQAType)))
annotations = {}
for _, row in tqdm.tqdm(df.iterrows(), total=len(df)):
for answer in row.answers:
sent = row.question + " " + answer
closest = index.get_nns_by_vector(embeddings[sent], 75)
closest = list(map(lambda sid: sentence_ids[sid], closest))
annotations[sent] = closest
pickle.dump(annotations, open("annotations.pkl", "wb"))
print("Annotations written to annotations.pkl")
def test_very_large_index(self):
# 388
f = 3
dangerous_size = 2**31
size_per_vector = 4 * (f + 3)
n_vectors = int(dangerous_size / size_per_vector)
m = AnnoyIndex(3, 'angular')
m.verbose(True)
for i in range(100):
m.add_item(n_vectors + i, [random.gauss(0, 1) for z in range(f)])
n_trees = 10
m.build(n_trees)
path = 'test_big.annoy'
m.save(path) # Raises on Windows
# Sanity check size of index
self.assertGreaterEqual(os.path.getsize(path), dangerous_size)
self.assertLess(os.path.getsize(path), dangerous_size + 100e3)
# Sanity check number of trees
self.assertEquals(m.get_n_trees(), n_trees)
class AnnoySearch:
def __init__(self,
vec_dim=2048,
lmdb_file="static/lmdb",
ann_file="static/annoy_file/tree.ann",
metric='angular',
num_trees=10):
self.vec_dim = vec_dim # 要index的向量维度
self.metric = metric # 度量可以是"angular"，"euclidean"，"manhattan"，"hamming"，或"dot"
self.annoy_instance = AnnoyIndex(self.vec_dim, self.metric)
self.lmdb_file = lmdb_file
self.ann_file = ann_file
self.num_trees = num_trees
self.logger = logging.getLogger('AnnoySearch')
def save_annoy(self):
self.annoy_instance.save(self.ann_file)
self.logger.info('save annoy SUCCESS !')
def unload_annoy(self):
self.annoy_instance.unload()
def load_annoy(self):
try:
self.annoy_instance.unload()
self.annoy_instance.load(self.ann_file)
self.logger.info('load annoy SUCCESS !')
except FileNotFoundError:
self.logger.error(
'annoy file DOES NOT EXIST , load annoy FAILURE !',
exc_info=True)
# 创建annoy索引
def create_index_from_lmdb(self):
# 遍历
lmdb_file = self.lmdb_file
if os.path.isdir(lmdb_file):
evn = lmdb.open(lmdb_file)
wfp = evn.begin()
for key, value in wfp.cursor():
key = int(key)
value = str2embed(value)
print(len(value))
self.annoy_instance.add_item(key, value)
self.annoy_instance.build(self.num_trees)
self.annoy_instance.save(self.ann_file)
def build_annoy(self):
self.annoy_instance.build(self.num_trees)
def get_nns_by_item(self,
index,
nn_num,
search_k=-1,
include_distances=False):
return self.annoy_instance.get_nns_by_item(index, nn_num, search_k,
include_distances)
def get_nns_by_vector(self,
vec,
nn_num,
search_k=-1,
include_distances=False):
return self.annoy_instance.get_nns_by_vector(vec, nn_num, search_k,
include_distances)
def get_n_items(self):
return self.annoy_instance.get_n_items()
def get_n_trees(self):
return self.annoy_instance.get_n_trees()
def get_vec_dim(self):
return self.vec_dim
def add_item(self, index, vec):
self.annoy_instance.add_item(index, vec)
def get_item_vector(self, index):
return self.annoy_instance.get_item_vector(index)
def test_get_n_trees(self):
i = AnnoyIndex(10, 'angular')
i.load('test/test.tree')
self.assertEqual(i.get_n_trees(), 10)
def find(location, path):
"""find the closest images to an image
Given a path or a url to an image, returns the closest matches
(phash hamming distance)
Arguments:
location: 'url' or 'path'
path: the actual url or path to the image
"""
# load database and annoy index
index = AnnoyIndex(64, metric='hamming')
index.load('live/phash_index.ann')
conn = sqlite3.connect('live/twitter_scraper.db')
c = conn.cursor()
# load the requested image
img = load_image(location, path)
start_time = time.time()
# get the image's phash
phash = imagehash.phash(img)
phash_arr = phash.hash.flatten()
# find the closest matches
n = 16
n_trees = index.get_n_trees()
ann_start_time = time.time()
annoy_results = index.get_nns_by_vector(phash_arr,
n,
include_distances=True,
search_k=100 * n * n_trees)
ann_end_time = time.time()
# look up the location of the match and its tweet info
results = []
for idx, score in map(list, zip(*annoy_results)):
# only keep close enough matches
if score > 8:
break
# find respective image in database
c.execute('SELECT path, filename FROM hashes WHERE idx=(?)', (idx, ))
dirname, basename = c.fetchone()
c.execute('SELECT id FROM info WHERE filename=(?) AND path=(?)',
(basename, dirname))
tweet_id = c.fetchone()
tweet_id = tweet_id[0]
results.append((score, tweet_id, basename))
conn.close()
# sort results
results = sorted(results, key=lambda x: (-x[0], x[1]))
end_time = time.time()
print(results)
print(f"total search time (phash): {end_time - start_time:06f} seconds")
print(
f"annoy search time (phash): {ann_end_time - ann_start_time:06f} seconds"
)
return results
class Retriever(object):
def __init__(self, args, tokenizer, hidden_size=768):
self.embedmodel = SentenceTransformer('bert-base-nli-mean-tokens')
self.tokenizer = tokenizer
self.embed_list = []
self.sentence_list = []
self.sentence2exp = {}
self.annoy = AnnoyIndex(hidden_size, metric='angular')
self.load_exp(args.labeled_data)
self.loaded = False
# self.load_unlabeled_sen(args.unlabeled_data)
def load_exp(self, filename):
sentence_list = []
with open(filename, encoding='utf-8') as f:
json_file = json.load(f)
for item in json_file:
if 'term' in item:
sentence = item['term'] + self.tokenizer.sep_token + item[
'sent']
else:
sentence = item['sent']
exp = item['exp']
sentence_list.append(sentence)
self.sentence2exp[sentence] = exp
self.embed_list.extend(
self.embedmodel.encode(sentence_list, show_progress_bar=True))
for i, embed in enumerate(self.embed_list):
self.annoy.add_item(i, embed)
self.sentence_list.extend(sentence_list)
def load_unlabeled_sen(self, filename):
sentence_list = []
with open(filename, encoding='utf-8') as f:
json_file = json.load(f)
for item in json_file:
if 'term' in item:
sentence = item['term'] + self.tokenizer.sep_token + item[
'sent']
else:
sentence = item['sent']
sentence_list.append(sentence)
self.sentence_list.extend(sentence_list)
self.embed_list.extend(
self.embedmodel.encode(sentence_list, show_progress_bar=True))
for i, embed in enumerate(self.embed_list):
self.annoy.add_item(i, embed)
self.loaded = True
def update_exp(self, sentence_list, exp_list):
for sen, exp in zip(sentence_list, exp_list):
self.sentence2exp[sen] = exp
def retrieve(self, sentence, nums, get_similar=False):
if self.annoy.get_n_trees() == 0:
self.annoy.build(100)
if sentence in self.sentence_list:
index = self.sentence_list.index(sentence)
result = self.annoy.get_nns_by_item(index,
nums,
include_distances=get_similar)
else:
target_embed = self.embedmodel.encode([sentence],
show_progress_bar=False)[0]
result = self.annoy.get_nns_by_vector(
target_embed, nums, include_distances=get_similar)
if get_similar:
candidate_exp = [
self.sentence2exp[self.sentence_list[index]]
for index in result[0]
]
return candidate_exp, result[1]
else:
candidate_exp = [
self.sentence2exp[self.sentence_list[index]]
for index in result
]
return candidate_exp
def compute_sim(self, embed1, embed2):
return np.dot(embed1, embed2)
class AnnoySearch:
def __init__(self, vec_dim=100, metric='angular'):
self.vec_dim = vec_dim # 要index的向量维度
self.metric = metric # 度量可以是"angular"，"euclidean"，"manhattan"，"hamming"，或"dot"
self.annoy_instance = AnnoyIndex(self.vec_dim, self.metric)
self.logger = logging.getLogger('AnnoySearch')
def save_annoy(self, annoy_file, prefault=False):
self.annoy_instance.save(annoy_file, prefault=prefault)
self.logger.info('save annoy SUCCESS !')
def unload_annoy(self):
self.annoy_instance.unload()
def load_annoy(self, annoy_file, prefault=False):
try:
self.annoy_instance.unload()
self.annoy_instance.load(annoy_file, prefault=prefault)
self.logger.info('load annoy SUCCESS !')
except FileNotFoundError:
self.logger.error(
'annoy file DOES NOT EXIST , load annoy FAILURE !',
exc_info=True)
# 创建annoy索引
def build_annoy(self, n_trees):
self.annoy_instance.build(n_trees)
# 查询最近邻，通过index
def get_nns_by_item(self,
index,
nn_num,
search_k=-1,
include_distances=False):
return self.annoy_instance.get_nns_by_item(index, nn_num, search_k,
include_distances)
# 查询最近邻，通过向量
def get_nns_by_vector(self,
vec,
nn_num,
search_k=-1,
include_distances=False):
return self.annoy_instance.get_nns_by_vector(vec, nn_num, search_k,
include_distances)
def get_n_items(self):
return self.annoy_instance.get_n_items()
def get_n_trees(self):
return self.annoy_instance.get_n_trees()
def get_vec_dim(self):
return self.vec_dim
# 添加item
def add_item(self, index, vec):
self.annoy_instance.add_item(index, vec)
def get_item_vector(self, index):
return self.annoy_instance.get_item_vector(index)
def find_similar(img_path, location='file'):
print(img_path)
global kmeans
# load files
annoy_map = joblib.load('live/BOW_annoy_map.pkl')
kmeans = joblib.load('live/kmeans.pkl')
index = AnnoyIndex(kmeans.n_clusters, 'angular')
index.load('live/BOW_index.ann')
conn = sqlite3.connect('live/twitter_scraper.db')
c = conn.cursor()
# compute histogram
start_time = time.time()
try:
hist = image_detect_and_compute(img_path, location=location)
except cv2.error:
return []
# find most similar images
n = 12
n_trees = index.get_n_trees()
ann_start_time = time.time()
annoy_results = index.get_nns_by_vector(hist,
n,
include_distances=True,
search_k=-1)
ann_end_time = time.time()
# process results
results = []
max_score = -1
for i, idx in enumerate(annoy_results[0]):
# discard bad results
if annoy_results[1][i] > 1.0:
break
score = int(100 * (1 - annoy_results[1][i]))
if i == 0:
max_score = score
elif max_score - score > 10:
break
# get tweet info
path = annoy_map[idx]
basename = os.path.basename(path)
dirname = os.path.dirname(path)
c.execute('SELECT id FROM info WHERE filename=(?) AND path=(?)',
(basename, dirname))
tweet_id = c.fetchone()[0]
tup = (
score,
tweet_id,
basename,
)
results.append(tup)
end_time = time.time()
print(results)
print(f"total search time (cbir): {end_time - start_time:06f} seconds")
print(
f"annoy search time (cbir): {ann_end_time - ann_start_time:06f} seconds"
)
return results
def test_get_n_trees(self):
i = AnnoyIndex(10)
i.load('test/test.tree')
self.assertEqual(i.get_n_trees(), 10)
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 13 10:57:22 2019
@author: Kazem
"""
from annoy import AnnoyIndex
dim = 2
a = AnnoyIndex(dim,'euclidean')
points = [[1,0],[2,1],[1,3],[-2,2],[-1,-2],[3,-1],[-1,3]]
for i,v in enumerate(points):
a.add_item(i,v)
print(str(a.get_n_items())+ " items are added")
a.build(30)
print(str(a.get_n_trees())+ " trees are made")
result = a.get_nns_by_item(6,2)
items = a.get_nns_by_vector([0,4],2)
