使用所有可用RAM后，会话崩溃

Question

我是正则表达式的新手。在google colaboratory中，在基于Twitter数据集对一袋单词进行赋值时，我给出了这样的代码来修改给定数据集中的Twitter Tweet。

#Replacing 2 or more repetitions of character with the character itself
def replaceTwoOrMore(s):
    pattern = re.compile(r"(.)\1{1,}", re.DOTALL)
    return pattern.sub(r"\1\1", s)

def tweets_reconstruction(tweet):
  #Removing numbers
  tweet = re.sub('[0-9]', '', tweet)
  #Convert to lower case
  tweet = tweet.lower()
  tweet = tweet.translate(str.maketrans('', '', string.punctuation))
  #Replacing short URLs with ""
  tweet = re.sub(r"[\b(http)]+", "", tweet)
  #Replacing "@username" with "AT_USER"
  tweet = re.sub(r"[\b(@)]+", "AT_USER", tweet)
  #Replacing "#word" with "word"
  tweet = re.sub(r'#([^\s]+)', r'\1', tweet)
  #Replacing multiple whitespaces with single whitespace
  tweet = re.sub(r"[\s]+", " ", tweet)
  tweet = replaceTwoOrMore(tweet)
  return tweet

processedTweets = []
for tweet in tweets:
  processedTweets.append(tweets_reconstruction(tweet))

vectorizer = CountVectorizer()
featurevector = vectorizer.fit_transform(processedTweets)
featurevector.todense()

在运行时，它显示“使用所有可用RAM后会话崩溃” 请帮帮我。