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[英]word not in vocabulary after training gensim word2vec model, why?
[英]Why do I get single letter vocabulary in Gensim word2vec?
我正在構建一個word2vec模型,如下所示。
from gensim.models import word2vec, Phrases
documents = ["the mayor of new york was there", "human computer interaction and machine learning has now become a trending research area","human computer interaction is interesting","human computer interaction is a pretty interesting subject", "human computer interaction is a great and new subject", "machine learning can be useful sometimes","new york mayor was present", "I love machine learning because it is a new subject area", "human computer interaction helps people to get user friendly applications"]
sentence_stream = [doc.split(" ") for doc in documents]
bigram = Phrases(sentence_stream, min_count=1, delimiter=b' ')
trigram = Phrases(bigram[sentence_stream], min_count=1, delimiter=b' ')
for sent in sentence_stream:
bigrams_ = bigram[sent]
trigrams_ = trigram[bigram[sent]]
print(bigrams_)
print(trigrams_)
# Set values for various parameters
num_features = 10 # Word vector dimensionality
min_word_count = 1 # Minimum word count
num_workers = 4 # Number of threads to run in parallel
context = 5 # Context window size
downsampling = 1e-3 # Downsample setting for frequent words
model = word2vec.Word2Vec(trigrams_, workers=num_workers, \
size=num_features, min_count = min_word_count, \
window = context, sample = downsampling)
vocab = list(model.wv.vocab.keys())
print(vocab[:10])
但是,我得到的模型詞匯輸出是單個字符,如下所示。
['h', 'u', 'm', 'a', 'n', ' ', 'c', 'o', 'p', 't']
我正確地得到了雙胞胎和三卦。 因此,我只是把代碼弄錯了。 請告訴我這是什么問題?
這解決了我的問題。 我應該將列表列表傳遞給word2vec模型,如下所示。
trigram_sentences_project = []
bigram = Phrases(sentence_stream, min_count=1, delimiter=b' ')
trigram = Phrases(bigram[sentence_stream], min_count=1, delimiter=b' ')
for sent in sentence_stream:
#bigrams_ = [b for b in bigram[sent] if b.count(' ') == 1]
#trigrams_ = [t for t in trigram[bigram[sent]] if t.count(' ') == 2]
bigrams_ = bigram[sent]
trigrams_ = trigram[bigram[sent]]
trigram_sentences_project.append(trigrams_)
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