def calculate_BM25(keywords, lst): #calculates the BM25 weights
maxweight = -1000
results = []
stopWords = set(stopwords.words('portuguese'))
for i in range(len(keywords)):
keywords[i] = keywords[i].lower()
new_keywords = [word for word in keywords if word not in stopWords]
#print(new_keywords)
corpus = create_corpus(lst)
#print(corpus)
bm25 = BM25.BM25(corpus)
average_idf = sum(float(val) for val in bm25.idf.values()) / len(
bm25.idf) #average idf
#print(average_idf)
scores = bm25.get_scores(new_keywords, average_idf) #bm25 scores
#print(scores)
for i in range(len(scores)):
if scores[i] != 0:
results = results + [[
scores[i], get_title(lst[i]),
get_party(lst[i])
]] #different than 0 scores
results.sort(key=lambda document: document[0],
reverse=True) #most relevant ones
return results, new_keywords
def create_bm25():
"""Function to create or update BM25 object"""
# Run arguments
parser = argparse.ArgumentParser()
parser.add_argument("--task",
default=4,
type=int,
help="Task where: \
-task 1 : classification subcat \
-task 2 : classification cat \
-task 3 : ner \
-task 4 : qa")
parser.add_argument('--register_model', action='store_true', help="")
parser.add_argument('--download_train', action='store_true', help="")
args = parser.parse_args()
# Load data
cl = pr.Clean(task=args.task, download_train=args.download_train)
data = cl.dt.load('fn_clean', dir='data_dir')
# Split tokenized data
toks = data.question_clean.apply(cl.transform_by_task).to_list()
# Create BM25 Object
bm = bm25.BM25(toks)
# Dump objects
with open(cl.dt.get_path('fn_rank', 'model_dir'), 'wb') as fp:
pickle.dump(bm, fp)
pickle.dump(data, fp)
logger.warning('[INFO] Created and stored BM25 object.')
# Upload
if args.register_model:
cl.dt.upload('model_dir', destination='model')
def train(self, knownDocuments):
for root,dirs,files in os.walk(dirname):
for f in knownDocuments:
corpus.append(tokenization(f))
filenames.append(f)
dictionary = corpora.Dictionary(corpus)
doc_vectors = [dictionary.doc2bow(text) for text in corpus]
vec1 = doc_vectors[0]
bm25Model = bm25.BM25(corpus)
average_idf = sum(map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(bm25Model.idf.keys())
def analyze(self, unknownDocument):
url_k_words = "articles/sanchongmen_ch5.txt"
sentence = open(url_k_words,"rb").read()
# Based on TF-IDF to get key words
# tags = jieba.analyse.extract_tags(sentence, withWeight=True, topK=20, allowPOS=())
# Based on TextRank to get top K words
tags =jieba.analyse.textrank(sentence, topK=20, withWeight=False, allowPOS=('ns', 'n', 'vn', 'v'))
query = tags
scores = bm25Model.get_scores(query)
# scores.sort(reverse=True)
idx = scores.index(max(scores))
fname = filenames[idx]
return fname
def displayName():
return "BM25 Driver for Chinese"
def get_ranks_baseline(data, tables):
texts, id_to_index = get_table_words(tables)
dictionary = corpora.Dictionary(texts)
corpus = [dictionary.doc2bow(text) for text in texts]
bm25_obj = bm25.BM25(corpus)
ranks, num_samples = [], len(data)
for count, one_data in enumerate(data):
id, query = one_data['table_id'], one_data['question_tokens']
query_doc = dictionary.doc2bow(query.split())
scores = bm25_obj.get_scores(query_doc)
score_tuples = [(score, i) for i, score in enumerate(scores)]
score_tuples.sort(reverse=True)
target_index = id_to_index[id]
rank = -1
for index, tup in enumerate(score_tuples):
cur_index = tup[1]
if cur_index == target_index:
rank = index + 1
break
if rank != -1:
ranks.append(rank)
else:
print('Invalid baseline input')
if count % 100 == 0:
print('Done ' + str(count) + ' out of ' + str(num_samples) + ' inputs')
return ranks
def get_fitness_answer(input_seq):
# 通过bm25的相似度匹配问题
input_seq = get_final_input(input_seq)
bm25Model = bm25.BM25(question_list)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
scores = bm25Model.get_scores(input_seq, average_idf)
sorted_scores = list(set(scores))
sorted_scores.sort()
answer = []
question = []
if sorted_scores[-1] > 0:
one = scores.index(sorted_scores[-1])
answer.append(get_key(question_answer_direct, question_list[one]))
question.append(get_key(qa_dict, answer_list[one]))
if sorted_scores[-2] > 0:
two = scores.index(sorted_scores[-2])
answer.append(get_key(question_answer_direct, question_list[two]))
question.append(get_key(qa_dict, answer_list[two]))
if sorted_scores[-3] > 0:
three = scores.index(sorted_scores[-3])
answer.append(
get_key(question_answer_direct, question_list[three]))
question.append(get_key(qa_dict, answer_list[three]))
return answer, question
def buildModel(jsonFile, fieldNames, query_str):
# iterable 不能循环两次，所以创建两个变量
t1 = jsonutil.iterCutFieldList(jsonFile, fieldNames)
t2 = jsonutil.iterCutFieldList(jsonFile, fieldNames)
# 建立单词索引字典
dictionary = corpora.Dictionary(t1)
dictionary.save(DICTIONARY_PATH)
# 建立词袋模型.将词汇表示的文本，转换成用id表示
corpus = [dictionary.doc2bow(text) for text in t2]
print("词袋: %i " % len(corpus))
bm25Model = bm25.BM25(corpus)
# print("bm25 idf lens: %i " %len(bm25Model.f))
average_idf = sum(map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(bm25Model.idf.keys())
query = jiebautil.cutWords(query_str).split()
query_bow = dictionary.doc2bow(query)
scores = bm25Model.get_scores(query_bow, average_idf)
# i = scores.index(max(scores))
lineRead = LineReader(jsonFile)
for i in range(5):
score = max(scores)
lineNum = scores.index(score) + 1
s = lineRead.load(lineNum)
j = json.loads(s)
print(jsonutil.recursive_get(j, fieldNames[0]))
del scores[lineNum-1]
def get_fitness_answer(input_seq):
# 通过bm25的相似度匹配问题
input_seq = get_final_input(input_seq)
bm25Model = bm25.BM25(question_list)
scores = bm25Model.get_scores(input_seq)
sorted_scores = list(set(scores))
sorted_scores.sort()
answer = []
question = []
if sorted_scores[-1] > 0:
one = scores.index(sorted_scores[-1])
answer.append(get_key(question_answer_direct, question_list[one]))
question.append(get_key(qa_dict, answer_list[one]))
if sorted_scores[-2] > 0:
two = scores.index(sorted_scores[-2])
answer.append(get_key(question_answer_direct, question_list[two]))
question.append(get_key(qa_dict, answer_list[two]))
if sorted_scores[-3] > 0:
three = scores.index(sorted_scores[-3])
answer.append(
get_key(question_answer_direct, question_list[three]))
question.append(get_key(qa_dict, answer_list[three]))
return answer, question
def train():
'''
匹配过程
:return:
'''
# 构建匹配语料库 398872 samples
sku_names_texts = get_train_datas()
sku_names_jieba = get_text_jieba(sku_names_texts)
print(len(sku_names_texts), len(sku_names_jieba))
print(sku_names_jieba[0])
# 测试数据 1000 samples
keywords_texts = get_test_datas()
keywords_jieba = get_text_jieba(keywords_texts)
print(len(keywords_texts))
# 统计词表
dictionary = corpora.Dictionary(sku_names_jieba)
print(len(dictionary))
# 用gensim建立BM25模型
bm25Model = bm25.BM25(sku_names_jieba)
# 根据gensim源码，计算平均逆文档频率
average_idf = sum(map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(bm25Model.idf.keys())
for i, item in enumerate(keywords_jieba):
scores = bm25Model.get_scores(item, average_idf)
# sorted_scores = sorted(scores, reverse=True)[:10]
idx = scores.index(max(scores))
print(i, "||", keywords_texts[i], "||", sku_names_texts[idx])
with open("result/bm25_v1_results.txt", 'a', encoding='utf8') as wf:
wf.write(str(i) + "||" + keywords_texts[i] + "||" + sku_names_texts[idx] + "\n")
def __init__(self,
corpus_file_pattern=None,
stop_words_file="stop_words.txt",
MAX_LEN=300,
path="./"):
"""
BM25检索模块，主要是在BM25库基础上封装了预处理部分。
:param corpus_file_pattern: 检索资料库-文本数据 str
:param stop_words_file: 停用词表 str
:param path: 保存的模型目录 str
"""
os.makedirs(path, exist_ok=True)
self.model = os.path.join(path, "bm25.m")
self.sen = os.path.join(path, "sen.pkl")
self.stop = os.path.join(path, "stop.pkl")
self.MAX_LEN = MAX_LEN
if os.path.isfile(self.model) and os.path.isfile(
self.sen) and os.path.isfile(self.stop):
self.load()
else:
assert corpus_file_pattern is not None, "Can not find model or corpus file."
if os.path.isfile(stop_words_file):
self.stop_words = self.load_stop_words(stop_words_file)
self.sentences, corpus = self.get_corpus(corpus_file_pattern)
self.bm25 = bm25.BM25(corpus)
self.dump()
def index_bm25():
lemmas = df['lemmas'].tolist()
lemmas = [doc.split(' ') for doc in lemmas]
dictionary = corpora.Dictionary(lemmas)
corpus = [dictionary.doc2bow(text) for text in lemmas]
bm25_obj = bm25.BM25(corpus)
return bm25_obj, dictionary
def getScores(dictionary):
bm25Model = bm25.BM25(corpus)
query = []
#对查询词分词
for word in query_str.strip().split():
query.append(word)
scores = bm25Model.get_scores(query)
return scores
def get_most_similarity_article(self):
"""
透過文章corpus取得average_idf，以便後續計算相關
"""
dictionary = corpora.Dictionary(self.corpus)
bm25Model = bm25.BM25(self.corpus)
average_idf = sum(map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(bm25Model.idf.keys())
return [bm25Model,average_idf]
def doc_process_bm25(raw_docs):
gen_docs = [[
w.lower() for w in tokenizer.tokenize(text) if not w in stop_words
] for text in raw_docs]
# dictionary = gensim.corpora.Dictionary(gen_docs)
# corpus = [dictionary.doc2bow(gen_doc) for gen_doc in gen_docs]
bm25Model = bm25.BM25(gen_docs)
return bm25Model
def _build(self):
# extract classes
self.classes = self.api.classes
self.class_docs = {
c.path: self._preprocess_text(c.embedded_text).split(" ")
for c in self.classes
}
self.index = bm25.BM25([self.class_docs[c.path] for c in self.classes])
def init_bm25(self, corpus):
ids, questions = [], []
for row in corpus:
ids.append(row['id'])
questions.append(row['tokens'])
self.idx2id = dict([(i, qid) for i, qid in enumerate(ids)])
self.id2idx = dict([(qid, i) for i, qid in enumerate(ids)])
self.bm25 = bm25.BM25(questions)
def creat_model(path_model, path_avgidf):
print("Creating bm25 model...")
bm25Model = bm25.BM25(corpus)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
pickle.dump(bm25Model, open(path_model, 'wb'))
pickle.dump(average_idf, open(path_avgidf, 'wb'))
return bm25Model, average_idf
def __init__(self):
self.tokenizer = tokenizers.get_class('ltp')()
self.docdb = retriever.get_class('sqlite')()
self.corpus = retriever.utils.load_corpus(retriever.DEFAULTS['bm25_corpus_path'])
self.bm25model = bm25.BM25(self.corpus)
self.avg_idf = sum(map(lambda k: float(self.bm25model.idf[k]), self.bm25model.idf.keys())) \
/ len(self.bm25model.idf.keys())
self.doc_titles = self.docdb.get_doc_ids()
self.idx2title = {idx: self.doc_titles[idx] for idx in range(len(self.doc_titles))}
def train(self):
if self.fresh:
print("重新分词，创建BM25模型...")
segs = self.initialize()
else:
print("从%s读入现有分词结果，创建BM25模型..." % file_questions_segs)
segs = read_file(file_questions_segs)
segs = [eval(x) for x in segs]
self.model = bm25.BM25(segs)
def training_bm25_model(data_set):
sentence_tmp_list = list()
for data in data_set:
seg_list = jieba.cut(data)
tmp_list = list()
for seg in seg_list:
tmp_list.append(seg)
sentence_tmp_list.append(tmp_list)
model = bm25.BM25(sentence_tmp_list)
return model
def build_bm25(datas):
corpus = []
docid2index = {}
for cur_id, cur_data in enumerate(datas):
corpus.append(cur_data['doc1']['tokens_without_stopwords'])
docid2index[cur_data['doc1']['docid']] = cur_id * 2
corpus.append(cur_data['doc2']['tokens_without_stopwords'])
docid2index[cur_data['doc2']['docid']] = cur_id * 2 + 1
bm25Model = bm25.BM25(corpus)
return bm25Model, docid2index
def get_fitness_answer(input_seq):
"""最后用bm25解决问题"""
input_seq = get_final_input(input_seq)
question_list, question_answer_direct = get_bm_data()
bm25Model = bm25.BM25(question_list)
scores = bm25Model.get_scores(input_seq)
max_score = max(scores)
idx = scores.index(max(scores))
answer = get_key(question_answer_direct, question_list[idx])
answer = str(answer[0])
return max_score, answer
def BM25(question_input):
documentation_id = question_input["docid"]
sentence = []
corpus = []
temp = []
temp_fini = []
for word in documentation[documentation_id]["text"]:
sentence.append([word])
for i in sentence:
for k in i:
word_list = k.split(" ")
corpus.append(word_list)
word_list = []
query_str = question_input["question"]
query_str_list = query_str.split(" ")
simply_corpus = simply(corpus)
bm25Model = bm25.BM25(simply_corpus)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
scores = bm25Model.get_scores(query_str_list, average_idf)
position = scores.index(max(scores))
aim_sentence = documentation[documentation_id]["text"][position]
aim_sentence_list = aim_sentence.split(".")
for a in aim_sentence_list:
temp_word = a.split(" ")
for k in temp_word:
temp.append(k)
temp_fini.append(temp)
temp = []
tmp_fini_simply = simply(temp_fini)
bm25Model = bm25.BM25(tmp_fini_simply)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
scores = bm25Model.get_scores(query_str_list, average_idf)
position = scores.index(max(scores))
aim_sentence = aim_sentence_list[position]
# print("aim_sentence",aim_sentence)
return aim_sentence
def bm25_sim(corpus, sent, topk=5):
'''
corpus:
['*****', '******', '******', ...]
sent: ['**', '*', '***', '**', ...]
'''
model = bm25.BM25(corpus)
scores = model.get_scores(sent)
scores = sorted(list(enumerate(scores)), key=lambda k: k[1],
reverse=True)[:topk]
index = [idx[0] for idx in scores]
def create_bm25_model(questions, answers):
questions_tokens = []
for q in tqdm(questions, desc="cut"):
q_tokens = n_grams(q, n)
questions_tokens.append(q_tokens)
model = bm25.BM25(questions_tokens)
average_idf = sum(float(val)
for val in model.idf.values()) / len(model.idf)
data = [model, answers, average_idf]
save_to_pkl(file=pkl_bm25, data=data)
return model, answers, average_idf
def __init__(self, corpus):
"""
Parameters
----------
corpus : list of list of str
Given corpus.
"""
self.bm25 = bm25.BM25(corpus)
self.average_idf = sum(
map(lambda k: float(self.bm25.idf[k]),
self.bm25.idf.keys())) / len(self.bm25.idf.keys())
def train_text():
# 测试文档预处理
test_doc = []
test_datas = pd.read_csv("test_data.csv", encoding="gbk")
test_titles = test_datas["title"]
for title in test_titles:
test_doc.append(title)
test_doc_list = []
for doc in test_doc:
doc_list = [word for word in jieba.cut(doc)]
test_doc_list.append(doc_list)
# 训练集预处理，去除噪声
train_doc = []
datas = pd.read_csv("train_data.csv")
train_titles = datas["title"]
for title in train_titles:
if 13 < len(title) < 500:
doc_list = [word for word in jieba.cut(title)]
all_doc_list.append(doc_list)
else:
all_doc_list.append("。")
all_doc_list = []
for doc in train_doc:
doc_list = [word for word in jieba.cut(doc)]
all_doc_list.append(doc_list)
# 制作词典
dictionary = corpora.Dictionary(all_doc_list)
dictionary.keys()
print(dictionary.num_pos)
dictionary.filter_extremes(no_below=25, no_above=0.5, keep_n=12330000)
bm25Model = bm25.BM25(all_doc_list)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
print(average_idf)
results = []
for doc_test_list in test_doc_list:
score = bm25.BM25.get_scores(bm25Model, doc_test_list, average_idf)
similiar_sorted = sorted(enumerate(score),
key=lambda item: -item[1])[:21]
indexs = [str(item[0] + 1) for item in similiar_sorted]
results.append(" ".join(indexs))
#写入文件
with open("answers.txt", "w") as f:
for item in results:
item = item.strip().split()
f.write("source_id" + "\t" + "target_id" + "\n")
for i in range(1, 21):
f.write(item[0] + "\t" + item[i] + "\n")
def load_bm25():
data = load_data()
lst_question = data['question'].apply(
lambda x: preprocessing(str(x))).tolist()
# lst_answer = data['answer'].apply(lambda x: preprocessing(str(x))).tolist()
# lst_qa = lst_question + lst_answer
texts = [item.split() for item in lst_question]
dictionary = corpora.Dictionary(texts)
corpus = [dictionary.doc2bow(text) for text in texts]
bm25_obj = bm25.BM25(corpus)
params = {"BM25": bm25_obj, "texts": texts, 'dictionary': dictionary}
return params
def BMsort(list1, query_str): ##list1指新闻构成的列表，query_str:指用户输入检索词
dic = corpora.Dictionary(list1)
bm25Model = bm25.BM25(list1)
average_idf = sum(
map(lambda k: float(bm25Model.idf[k]), bm25Model.idf.keys())) / len(
bm25Model.idf.keys())
query_str = jieba.cut(query_str)
query_str = " ".join(query_str)
query = []
for word in query_str.strip().split():
query.append(word)
scores = bm25Model.get_scores(query, average_idf)
return scores
def baselines_eval():
rankings_to_eval = read_query_test_rankings()
qrels = parse_qrels()
query_ids = list(qrels.keys())
query_lookup = get_robust_eval_queries()
queries = [query_lookup[query_id] for query_id in query_ids]
k = 10 if len(sys.argv) == 1 else int(sys.argv[1])
document_lookup = read_cache(name('./doc_lookup.json', ['with_titles']),
get_robust_documents_with_titles)
document_title_to_id = read_cache('./document_title_to_id.json',
lambda: print('failed'))
ordered_rankings_to_eval = [[
document_title_to_id[title] for title in rankings_to_eval[query]
] for query in query_ids]
ordered_qrels = [[document_title_to_id[title] for title in qrels[query]]
for query in query_ids]
document_id_to_title = _.invert(document_title_to_id)
doc_ids = range(len(document_id_to_title))
documents = [
document_lookup[document_id_to_title[doc_id]] for doc_id in doc_ids
]
tokenizer = Tokenizer(
rules=[handle_caps, fix_html, spec_add_spaces, rm_useless_spaces])
tokenized_documents = read_cache(
'tok_docs.json',
lambda: tokenizer.process_all(clean_documents(documents)))
tokenized_queries = tokenizer.process_all(clean_documents(queries))
bm25 = gensim_bm25.BM25(tokenized_documents)
# with open('./caches/106756_most_common_doc.json', 'r') as fh:
# doc_token_set = set(json.load(fh))
# corpus, token_lookup = tokens_to_indexes(tokenized_documents,
# None,
# token_set=doc_token_set)
# corpus = [[[token_lookup[term], f] for term, f in doc_fs.items()] for doc_fs in bm25.f]
# tfidf = TfidfModel(corpus)
# lsi = LsiModel(tfidf, id2word=_.invert(token_lookup), num_topics=300)
glove_rankings = []
# lsi_rankings = []
glove = get_glove_lookup(embedding_dim=300, use_large_embed=True)
encoded_docs = torch.stack(
[encode_glove_fs(glove, bm25.idf, doc_fs) for doc_fs in bm25.f])
encoded_docs = encoded_docs / torch.norm(encoded_docs, dim=1).unsqueeze(1)
for q, qml_ranking in progressbar(zip(tokenized_queries,
ordered_rankings_to_eval),
max_value=len(tokenized_queries)):
doc_ids = qml_ranking[:k] if '--rerank' in sys.argv else None
glove_rankings.append(
rank_glove(glove, bm25.idf, encoded_docs, q, doc_ids=doc_ids))
# lsi_rankings.append(rank_lsi(lsi, tfidf, [token_lookup[term] if term in token_lookup else 0 for term in q], doc_ids=doc_ids))
print('indri:', metrics_at_k(ordered_rankings_to_eval, ordered_qrels, k))
print('glove:', metrics_at_k(glove_rankings, ordered_qrels, k))
def bm25_sim(corpus, result, topk=5):
data = []
with open(corpus, encoding='utf-8') as fcor:
for line in tqdm(fcor):
line = json.loads(line.strip())
data.append(line['query'])
with open(result, 'w', encoding='utf-8') as fres:
stime = time.time()
step = 1
while len(data) > 5000:
query = data.pop(0)
model = bm25.BM25(data)
scores = model.get_scores(query)
scores = sorted(list(enumerate(scores)),
key=lambda k: k[1],
reverse=True)
index = [scores[0][0]]
index_remove = [scores[0][0]]
temp = ''.join(query)
for i in range(1, 100):
idx, score = scores[i]
if abs(score - scores[i - 1][1]) > 1e-4 and temp != ''.join(
data[idx]):
index.append(idx)
index_remove.append(idx)
if len(index) >= topk or score < 15.0:
break
ids = len(index_remove)
for i in range(ids, 100):
if scores[i][1] >= scores[ids - 1][1] - 1.0:
index_remove.append(scores[i][0])
if scores[0][1] > 20.0 and len(index) >= 3:
output = {}
output['query'] = ' '.join(query)
output['candidates'] = [' '.join(data[i]) for i in index]
fres.write(json.dumps(output, ensure_ascii=False) + '\n')
index_remove = sorted(index_remove, reverse=True)
for idx in index_remove:
data.pop(idx)
if step % 100 == 0:
fres.flush()
print('step: %d, spend-time: %.4f' %
(step, time.time() - stime))
stime = time.time()
step += 1