我正在尝试使用tidytext同时使用bigram和trigram。我可以使用什么代码来代替2和3个单词。
这是仅使用bigrams的代码:
library(tidytext)
library(janeaustenr)
austen_bigrams <- austen_books() %>%
unnest_tokens(bigram, text, token = "ngrams", n = 2)
austen_bigrams
答案 0 :(得分:6)
如果查看?unnest_tokens
,它会告诉您...
是否传递给tokenizer的参数。对于ngrams,那是tokenizers::tokenize_ngrams
,如果你查看它的帮助页面,它有一个n_min
参数,所以你可以这样做
library(magrittr)
library(tidytext)
library(janeaustenr)
austen_bigrams <- austen_books() %>%
head(1000) %>% # otherwise this will get very large
unnest_tokens(bigram, text, token = "ngrams", n = 3, n_min = 2)
austen_bigrams
#> # A tibble: 19,801 x 2
#> book bigram
#> <fctr> <chr>
#> 1 Sense & Sensibility sense and
#> 2 Sense & Sensibility sense and sensibility
#> 3 Sense & Sensibility and sensibility
#> 4 Sense & Sensibility and sensibility by
#> 5 Sense & Sensibility sensibility by
#> 6 Sense & Sensibility sensibility by jane
#> 7 Sense & Sensibility by jane
#> 8 Sense & Sensibility by jane austen
#> 9 Sense & Sensibility jane austen
#> 10 Sense & Sensibility jane austen 1811
#> # ... with 19,791 more rows