我正在尝试使用stm运行LDA主题建模分析,但是我的元数据有问题,它似乎工作正常,但我有一个协方差(Age),如本示例所示,未被读取。
我有一些推文(excel文件中的文档列),带有Age covariate(Young,Old)值。
这是我的数据http://www.mediafire.com/file/5eb9qe6gbg22o9i/dada.xlsx/file
library(stm)
library(readxl)
library(quanteda)
library(stringr)
library(tm)
data <- read_xlsx("C:/dada.xlsx")
#Remove URL's
data$docu <- str_replace_all(data$docu, "https://t.co/[a-z,A-Z,0-9]*","")
data$docu <- gsub("@\\w+", " ", data$docu) # Remove user names (all proper names if you're wise!)
data$docu <- iconv(data$docu, to = "ASCII", sub = " ") # Convert to basic ASCII text to avoid silly characters
data$docu <- gsub("#\\w+", " ", data$docu)
data$docu <- gsub("http.+ |http.+$", " ", data$docu) # Remove links
data$docu <- gsub("[[:punct:]]", " ", data$docu) # Remove punctuation)
data$docu<- gsub("[\r\n]", "", data$docu)
data$docu <- tolower(data$docu)
#Remove Stopwords. "SMART" is in reference to english stopwords from the SMART information retrieval system and stopwords from other European Languages.
data$docu <- tm::removeWords(x = data$docu, c(stopwords(kind = "SMART")))
data$docu <- gsub(" +", " ", data$docu) # General spaces (should just do all whitespaces no?)
myCorpus <- corpus(data$docu)
docvars(myCorpus, "Age") <- as.factor(data$Age)
processed <- textProcessor(data$docu, metadata = data)
out <- prepDocuments(processed$documents, processed$vocab, processed$meta, lower.thresh = 2)
out$documents
out$meta
levels(out$meta)
First_STM <- stm(documents = out$documents, vocab = out$vocab,
K = 4, prevalence =~ Age ,
max.em.its = 25, data = out$meta,
init.type = "LDA", verbose = FALSE)
如我在代码中所示,我试图将Age定义为因子,我认为这不是必需的,因为运行textProcessor
可能已经足够了......但是当我运行levels(out$meta)
时,我得到NULL
值,所以当我运行stm
以获得我得到的实际主题内存分配错误..
您将Age
的元变量设置为此行中的因子
docvars(myCorpus, "Age") <- as.factor(data$Age)
但是你不要再使用myCorpus了。在接下来的步骤中,您将使用数据框data
进行预处理。尝试将数据框中的Age
定义为因子:
data$Age <- factor(data$Age)
然后在这之前使用它
processed <- textProcessor(data$docu, metadata = data)
out <- prepDocuments(processed$documents, processed$vocab, processed$meta, lower.thresh = 2)
然后你可以看看这样的水平:
levels(out$meta$Age)
我无法重现你的内存分配错误。 stm在我的机器上工作正常(Win 10 Pro,8GB Ram)。