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我有大约 20,000 个文档的语料库，我必须使用 LDA 训练该数据集以进行主题建模。

import logging, gensim

logging.basicConfig(format='%(asctime)s : %(levelname)s : %(message)s', level=logging.INFO)
id2word = gensim.corpora.Dictionary('questions.dict')
mm = gensim.corpora.MmCorpus('questions.mm')
lda = gensim.models.ldamodel.LdaModel(corpus=mm, id2word=id2word, num_topics=100, update_every=0, chunksize=3000, passes=20)
lda.print_topics(20)

每当我运行这个程序时，我都会遇到这个错误：

2013-04-28 09:57:09,750 : INFO : adding document #0 to Dictionary(0 unique tokens)
2013-04-28 09:57:09,759 : INFO : built Dictionary(11 unique tokens) from 14 documents (total 14 corpus positions)
2013-04-28 09:57:09,785 : INFO : loaded corpus index from questions.mm.index
2013-04-28 09:57:09,790 : INFO : initializing corpus reader from questions.mm
2013-04-28 09:57:09,796 : INFO : accepted corpus with 19188 documents, 15791 features, 106222 non-zero entries
2013-04-28 09:57:09,802 : INFO : using serial LDA version on this node
2013-04-28 09:57:09,808 : INFO : running batch LDA training, 100 topics, 20 passes over the supplied corpus of 19188 documents, updating model once every 19188 documents
2013-04-28 09:57:10,267 : INFO : PROGRESS: iteration 0, at document #3000/19188

Traceback (most recent call last):
File "C:/Users/Animesh/Desktop/NLP/topicmodel/lda.py", line 10, in <module>
lda = gensim.models.ldamodel.LdaModel(corpus=mm, id2word=id2word, num_topics=100, update_every=0, chunksize=3000, passes=20)
File "C:\Python27\lib\site-packages\gensim-0.8.6-py2.7.egg\gensim\models\ldamodel.py", line 265, in __init__
self.update(corpus)
File "C:\Python27\lib\site-packages\gensim-0.8.6-py2.7.egg\gensim\models\ldamodel.py", line 445, in update
self.do_estep(chunk, other)
File "C:\Python27\lib\site-packages\gensim-0.8.6-py2.7.egg\gensim\models\ldamodel.py", line 365, in do_estep
gamma, sstats = self.inference(chunk, collect_sstats=True)
File "C:\Python27\lib\site-packages\gensim-0.8.6-py2.7.egg\gensim\models\ldamodel.py", line 318, in inference
expElogbetad = self.expElogbeta[:, ids]
IndexError: index (11) out of range (0<=index<10) in dimension 1

我什至尝试更改LdaModel函数中的值，但总是遇到同样的错误！

应该做什么 ？

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1 回答 1

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您的字典（id2word）似乎与您的语料库对象（mm）不正确匹配。

无论出于何种原因，id2word（单词标记到 wordids 的映射）仅包含 11 个标记 2013-04-28 09:57:09,759 : INFO : built Dictionary(11 unique tokens) from 14 documents (total 14 corpus positions)

您的语料库包含 15791 个特征，因此当它查找 id > 10 的特征时，它会失败。ids in expElogbetad = self.expElogbeta[:, ids] 是特定文档中所有单词 id 的列表。

我会重新创建语料库和字典：

$ python -m gensim.scripts.make_wiki （来自 gensim LDA 教程）。

创建的字典的日志记录数据应该表明我认为远远超过 11 个标记。我自己也遇到过类似的问题。

于 2013-05-01T12:46:45.297 回答