Created
August 31, 2015 23:25
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Create Doc2Vec using Elasticsearch (while processing the data in parallel)
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from lxml import etree | |
from elasticsearch.helpers import scan | |
from elasticsearch import Elasticsearch | |
from multiprocessing import Pool | |
import bz2 | |
import gensim | |
import itertools | |
import logging | |
import nltk | |
import os | |
import re | |
import string | |
import random | |
import unicodedata | |
logging.basicConfig(format='%(asctime)s : %(levelname)s : %(message)s', level=logging.ERROR) | |
logging.getLogger('gensim').setLevel(logging.INFO) | |
tokenizer = nltk.tokenize.RegexpTokenizer(r'\w+') | |
parser = etree.XMLParser(recover=True) | |
es = Elasticsearch(['localhost']) | |
PROCESSES = 5 | |
def create_model(): | |
model = gensim.models.Doc2Vec(size=300, window=8, min_count=10, workers=16) | |
model.build_vocab(sentence_generator()) | |
alpha, min_alpha, passes = (0.025, 0.001, 10) | |
alpha_delta = (alpha - min_alpha) / passes | |
for epoch in range(0, passes): | |
model.alpha, model.min_alpha = alpha, alpha | |
model.train(sentence_generator()) | |
alpha -= alpha_delta | |
print('Finished epoch {}'.format(epoch)) | |
model.save('doc2vec_model_300_10') | |
def get_sentences(document): | |
sentences = nltk.sent_tokenize(document['fields']['content'][0]) | |
sentences = [tokenize(sent) for sent in sentences] | |
final = [] | |
for sentence_num, sentence in enumerate(sentences): | |
if len(sentence) == 0: | |
continue | |
final.append(gensim.models.doc2vec.TaggedDocument( | |
words=sentence, | |
tags=['{}_{}'.format(document['_id'], sentence_num)] | |
)) | |
return final | |
def sentence_generator(): | |
documents = scan( | |
es, index='nabu', | |
scroll='30m', fields='content' | |
) | |
with Pool(processes=PROCESSES) as p: | |
for sentences in p.imap(get_sentences, documents): | |
for sentence in sentences: | |
yield sentence | |
es_replace = re.compile(r'es$') | |
s_replace = re.compile(r's$') | |
def remove_plural(token): | |
token = es_replace.sub('', token) | |
token = s_replace.sub('', token) | |
return token | |
num_replace = re.compile(r'[0-9]+') | |
def tokenize(sentence): | |
token_list = [] | |
for token in tokenizer.tokenize(sentence): | |
nkfd_form = unicodedata.normalize('NFKD', token) | |
only_ascii = nkfd_form.encode('ASCII', 'ignore').decode('ascii') | |
final = num_replace.sub('DDD', only_ascii) | |
token_list.append(remove_plural(final.strip().lower())) | |
return token_list | |
if __name__ == '__main__': | |
create_model() |
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