r - 在 R 中识别和分组同义词

Question

我正在尝试识别和聚合给定数据集的同义词。请参阅下面的示例数据。

library(tm)
library(SnowballC)

dataset <- c("dad glad accept large admit large accept dad big large big accept big accept dad dad Happy dad accept glad papa dad Happy dad glad dad dad papa admit Happy big accept accept big accept dad Happy admit Happy Happy glad Happy dad accept accept large daddy large accept large large large big daddy accept admit dad admit daddy dad admit dad admit Happy accept accept Happy daddy accept admit")

docs <- Corpus(VectorSource(dataset))
dtm <- TermDocumentMatrix(docs)
m <- as.matrix(dtm)
sort(rowSums(m),decreasing=TRUE)

结果:

accept    dad  happy  admit  large    big  daddy   glad   papa 
    15     14      9      8      8      6      4      4      2 

我想使用我下载并安装的 wordnet 包为上述每个词查找同义词。例如，要获得“接受”的同义词，我可以这样做:

library(wordnet)
setDict("C:/Program Files (x86)/WordNet/2.1/dict")

filter <- getTermFilter("ExactMatchFilter", "accept", TRUE)
terms <- getIndexTerms("VERB", 1, filter)
getSynonyms(terms[[1]])

结果:

 [1] "accept"    "admit"     "assume"    "bear"      "consent"   "go for"    "have"      "live with"
 [9] "swallow"   "take"      "take on"   "take over"

现在，我想合并这两个结果集，以便按以下方式对同义词进行分组。为给定的组标记最常用的词(排名 1)，稍后按这些词进行分组，类似于此:

id  word    word_count  syn_group   rank
1   accept  15          1           1
5   admit   8           1           2
2   dad     14          2           1
8   daddy   4           2           2
9   papa    2           2           3
3   happy   9           3           1
7   glad    4           3           2
4   large   8           4           1
6   big     6           4           2

然后可以这样聚合

id  word    word_count
1   accept  15+8
2   dad     14+4+2
3   happy   9+4
4   large   8+6

那么最后的结果就是

id  word    word_count
1   accept  23
2   dad     20
3   large   14
4   happy   13

我遇到了几个问题，包括让 GetIndexTerms 循环遍历单词，无论它们是名词、动词等。希望这一切都有意义吗？任何帮助将非常感激。谢谢。

Answer 1

我们可以使用 dplyr

执行以下操作

library(dplyr)
df %>% 
  group_by(syn_group) %>%
  mutate(sum_word_count = sum(word_count)) %>% 
  filter(rank == 1)

数据:

df <- read.table(text = "id  word    word_count  syn_group   rank
1   accept  15          1           1
5   admit   8           1           2
2   dad     14          2           1
8   daddy   4           2           2
9   papa    2           2           3
3   happy   9           3           1
7   glad    4           3           2
4   large   8           4           1
6   big     6           4           2", header = T)

请下次发布dput 的输出。

编辑:这里有一些代码可以帮助您开始循环处理单词和词性，并存储同义词。剩下的就是确定当前术语是否是前一个术语的同义词，在这种情况下，您已经有了同义词，并且可以分配一个唯一的同义词组。接下来，您需要存储一些结果。最后，您需要计算排名，这只是 seq_along 同义词和一个 grep 来确定排名位置。这些注释提示您可能希望在何处包含这些提示的代码。

d <- data.frame(Term = row.names(m), word_count = m[,1])
all_pos <- c("ADJECTIVE", "ADVERB", "NOUN","VERB")
syns <- vector("list", length(all_pos))
for(w in seq(nrow(d))){
  # if sysns of (d$Term[w]) has been calculated skip over current w 
  emf <- getTermFilter("ExactMatchFilter", d$Term[w], TRUE)  
  for(i in seq_along(syns)){
    terms <- getIndexTerms(all_pos[i], 1, emf)
    if(is.null(terms)){
      syns[i] <- NA
    } else{
      syns[[i]] <-  getSynonyms(terms[[1]])
    }
  }
  # store the results of syns for current w 
}