[英]Gensim - TF-IDF, how to perform a proper genesis TF-IDF?
我正在尝试在我的学士论文的一部分上执行一些 NLP(更准确地说是一个 TF-IDF 项目)。
我将其中的一小部分导出到一个名为“thesis.txt”的文档中,似乎在将清理后的文本数据拟合到 gensim Dictionary 时遇到了问题。
所有的词都被标记化了,存储在一个词袋中,我不知道我做错了什么。
这是我得到的错误:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-317-73828cccaebe> in <module>
17
18 #Create dictionary
---> 19 dictionary = Dictionary(tokens_no_stop)
20
21 #Create bag of words
~/Library/Python/3.8/lib/python/site-packages/gensim/corpora/dictionary.py in __init__(self, documents, prune_at)
89
90 if documents is not None:
---> 91 self.add_documents(documents, prune_at=prune_at)
92
93 def __getitem__(self, tokenid):
~/Library/Python/3.8/lib/python/site-packages/gensim/corpora/dictionary.py in add_documents(self, documents, prune_at)
210
211 # update Dictionary with the document
--> 212 self.doc2bow(document, allow_update=True) # ignore the result, here we only care about updating token ids
213
214 logger.info(
~/Library/Python/3.8/lib/python/site-packages/gensim/corpora/dictionary.py in doc2bow(self, document, allow_update, return_missing)
250 """
251 if isinstance(document, string_types):
--> 252 raise TypeError("doc2bow expects an array of unicode tokens on input, not a single string")
253
254 # Construct (word, frequency) mapping.
TypeError: doc2bow expects an array of unicode tokens on input, not a single string
在此先感谢您的帮助:)(在我的代码下方查找)
from nltk import word_tokenize
from nltk.corpus import stopwords
from nltk.stem import WordNetLemmatizer
from collections import Counter
from gensim.corpora import Dictionary
from gensim.models.tfidfmodel import TfidfModel
f = open('/Users/romeoleon/Desktop/Python & R/NLP/TRIAL_THESIS/thesis.txt','r')
text = f.read()
#Tokenize text
Tokens = word_tokenize(text)
#Lower case everything
Tokens = [t.lower() for t in Tokens]
#Keep only leters
tokens_alpha = [t for t in Tokens if t.isalpha()]
#Remove stopwords
tokens_no_stop = [t for t in tokens_alpha if t not in stopwords.words('french')]
#Create Lemmatizer
lem = WordNetLemmatizer()
lemmatized = [lem.lemmatize(t) for t in tokens_no_stop]
#Create dictionary
dictionary = Dictionary(tokens_no_stop)
#Create bag of words
bow = [dictionary.doc2bow(line) for line in tokens_no_stop]
#Model TFID
tfidf = TfidfModel(bow)
bow_tfidf = tfidf[bow]
您的tokens_no_stop
是一个字符串列表,但Dictionary
需要一个字符串列表(更准确地说是字符串可迭代的迭代)。
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