我无法使用text2vec为测试数据创建tf-idf矩阵

Question

我正在按照this tutorial进行训练，就像我在训练中一样，但是它总是说同样的话。有人知道这是怎么回事吗？

> #Construct sample document-term matrix con el vectorizer inicial
> sample.it <- itoken(rawsample$Abstract, 
+                     preprocessor = prep_fun, 
+                     tokenizer = tok_fun, 
+                     ids = rawsample$id,
+                     progressbar = F) 
> sample.dtm <- create_dtm (sample.it, vectorizer, vtype = "dgTMatrix", progressbar = FALSE)
> sample.tfidf <- TfIdf$new() #define tfidf model
> sample.tfidf <- fit_transform(sample.dtm, tfidf)
Error in fit_transform.Matrix(sample.dtm, tfidf) : 
  inherits(model, "mlapiTransformation") is not TRUE
> sample.tfidf  = create_dtm(sample.it, vectorizer, vtype = "dgTMatrix", progressbar = FALSE) %>% 
+   transform(tfidf)
Error in transform.Matrix(., tfidf) : 
  inherits(model, "mlapiTransformation") is not TRUE

Answer 1

sample.tfidf <- TfIdf$new() #define tfidf model
sample.tfidf <- fit_transform(sample.dtm, tfidf)