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Update lemmatize.R #9

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22 changes: 22 additions & 0 deletions R/lemmatize.R
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Original file line number Diff line number Diff line change
Expand Up @@ -102,4 +102,26 @@ lemmatize_strings <- function(x, dictionary = lexicon::hash_lemmas, ...) {
x2$unhold(unlist(lemmatized))
}

#' Performs fast lemmatisation of the text
#' @return The text with replacemnets
#' @param text A vector of stroings
#' @param dictionary If NULL it will perform stemming. If else, a data frame with (word,replacement) as
fastLemma = function(text,dictionary = NULL){
splitted = text %>% stringr::str_split(pattern = " ")
if (is.null(dictionary)) {
unique_words = splitted %>% unlist() %>% unique()
lemmatised_words = textstem::lemmatize_words(unique_words)
dictionary = data.table(word = unique_words,replacement = lemmatised_words)
dictionary = dictionary[word != replacement]

}

hashed_dict = hashmap(dictionary$word, dictionary$replacement)
hashed_dict$cache_keys()
# Do the actual replacement
lapply(splitted,function(x) ifelse(x %in% hashed_dict$keys(),hashed_dict[[x]],x)) %>% lapply(function(x) paste0(x,collapse = " ")) %>% unlist

}