| setGeneric("collocationAnalysis", function(kco, ...) standardGeneric("collocationAnalysis") ) |
| |
| #' Collocation analysis |
| #' |
| #' @aliases collocationAnalysis |
| #' |
| #' @description |
| #' \Sexpr[results=rd, stage=render]{lifecycle::badge("experimental")} |
| #' |
| #' Performs a collocation analysis for the given node (or query) |
| #' in the given virtual corpus. |
| #' |
| #' @details |
| #' The collocation analysis is currently implemented on the client side, as some of the |
| #' functionality is not yet provided by the KorAP backend. Mainly for this reason |
| #' it is very slow (several minutes, up to hours), but on the other hand very flexible. |
| #' You can, for example, perform the analysis in arbitrary virtual corpora, use complex node queries, |
| #' and look for expression-internal collocates using the focus function (see examples and demo). |
| #' |
| #' To increase speed at the cost of accuracy and possible false negatives, |
| #' you can decrease searchHitsSampleLimit and/or topCollocatesLimit and/or set exactFrequencies to FALSE. |
| #' |
| #' Note that currently not the tokenization provided by the backend, i.e. the corpus itself, is used, but a tinkered one. |
| #' This can also lead to false negatives and to frequencies that differ from corresponding ones acquired via the web |
| #' user interface. |
| #' |
| #' @family collocation analysis functions |
| #' |
| #' @param lemmatizeNodeQuery if TRUE, node query will be lemmatized, i.e. x -> [tt/l=x] |
| #' @param minOccur minimum absolute number of observed co-occurrences to consider a collocate candidate |
| #' @param topCollocatesLimit limit analysis to the n most frequent collocates in the search hits sample |
| #' @param searchHitsSampleLimit limit the size of the search hits sample |
| #' @param stopwords vector of stopwords not to be considered as collocates |
| #' @param exactFrequencies if FALSE, extrapolate observed co-occurrence frequencies from frequencies in search hits sample, otherwise retrieve exact co-occurrence frequencies |
| #' @param seed seed for random page collecting order |
| #' @param expand if TRUE, \code{node} and \code{vc} parameters are expanded to all of their combinations |
| #' @param ... more arguments will be passed to \code{\link{collocationScoreQuery}} |
| #' @inheritParams collocationScoreQuery,KorAPConnection-method |
| #' @return Tibble with top collocates, association scores, corresponding URLs for web user interface queries, etc. |
| #' |
| #' @importFrom stringr str_match str_split str_detect |
| #' @importFrom dplyr anti_join arrange desc slice_head bind_rows |
| #' @importFrom purrr pmap |
| #' @importFrom tidyr expand_grid |
| #' |
| #' @examples |
| #' \donttest{ |
| #' # Find top collocates of "Packung" inside and outside the sports domain. |
| #' new("KorAPConnection", verbose = TRUE) %>% |
| #' collocationAnalysis("Packung", vc=c("textClass=sport", "textClass!=sport"), |
| #' leftContextSize=1, rightContextSize=1, topCollocatesLimit=20) %>% |
| #' dplyr::filter(logDice >= 5) |
| #' } |
| #' |
| #' \donttest{ |
| #' # Identify the most prominent light verb construction with "in ... setzen". |
| #' # Note that, currently, the use of focus function disallows exactFrequencies. |
| #' new("KorAPConnection", verbose = TRUE) %>% |
| #' collocationAnalysis("focus(in [tt/p=NN] {[tt/l=setzen]})", |
| #' leftContextSize=1, rightContextSize=0, exactFrequencies=FALSE, topCollocatesLimit=20) |
| #' } |
| #' |
| #' @export |
| setMethod("collocationAnalysis", "KorAPConnection", |
| function(kco, |
| node, |
| vc = "", |
| lemmatizeNodeQuery = FALSE, |
| minOccur = 5, |
| leftContextSize = 5, |
| rightContextSize = 5, |
| topCollocatesLimit = 200, |
| searchHitsSampleLimit = 20000, |
| ignoreCollocateCase = FALSE, |
| withinSpan = ifelse(exactFrequencies, "base/s=s", ""), |
| exactFrequencies = TRUE, |
| stopwords = RKorAPClient::synsemanticStopwords(), |
| seed = 7, |
| expand = length(vc) != length(node), |
| ...) { |
| # https://stackoverflow.com/questions/8096313/no-visible-binding-for-global-variable-note-in-r-cmd-check |
| word <- frequency <- NULL |
| |
| if(!exactFrequencies && (!is.na(withinSpan) && !is.null(withinSpan) && nchar(withinSpan)>0 )) { |
| stop(sprintf("Not empty withinSpan (='%s') requires exactFrequencies=TRUE", withinSpan), call. = FALSE) |
| } |
| |
| warnIfNoAccessToken(kco) |
| |
| if (lemmatizeNodeQuery) { |
| node <- lemmatizeWordQuery(node) |
| } |
| |
| if (length(node) > 1 || length(vc) > 1) { |
| grid <- if (expand) expand_grid(node=node, vc=vc) else tibble(node=node, vc=vc) |
| purrr::pmap(grid, function(node, vc, ...) |
| collocationAnalysis(kco, |
| node =node, |
| vc = vc, |
| minOccur = minOccur, |
| leftContextSize = leftContextSize, |
| rightContextSize = rightContextSize, |
| topCollocatesLimit = topCollocatesLimit, |
| searchHitsSampleLimit = searchHitsSampleLimit, |
| ignoreCollocateCase = ignoreCollocateCase, |
| withinSpan = withinSpan, |
| exactFrequencies = exactFrequencies, |
| stopwords = stopwords, |
| seed = seed, |
| expand = expand, |
| ...) ) %>% |
| bind_rows() |
| } else { |
| set.seed(seed) |
| candidates <- collocatesQuery( |
| kco, |
| node, |
| vc = vc, |
| minOccur = minOccur, |
| leftContextSize = leftContextSize, |
| rightContextSize = rightContextSize, |
| searchHitsSampleLimit = searchHitsSampleLimit, |
| ignoreCollocateCase = ignoreCollocateCase, |
| stopwords = stopwords, |
| ... |
| ) |
| |
| if (nrow(candidates) > 0) { |
| candidates <- candidates %>% |
| filter(frequency >= minOccur) %>% |
| head(topCollocatesLimit) |
| collocationScoreQuery( |
| kco, |
| node = node, |
| collocate = candidates$word, |
| vc = vc, |
| leftContextSize = leftContextSize, |
| rightContextSize = rightContextSize, |
| observed = if (exactFrequencies) NA else candidates$frequency, |
| ignoreCollocateCase = ignoreCollocateCase, |
| withinSpan = withinSpan, |
| ... |
| ) %>% |
| filter(.$O >= minOccur) %>% |
| dplyr::arrange(dplyr::desc(logDice)) |
| } else { |
| tibble() |
| } |
| } |
| } |
| ) |
| |
| #' @importFrom magrittr debug_pipe |
| #' @importFrom stringr str_match str_split str_detect |
| #' @importFrom dplyr as_tibble tibble rename filter anti_join tibble bind_rows case_when |
| #' |
| snippet2FreqTable <- function(snippet, |
| minOccur = 5, |
| leftContextSize = 5, |
| rightContextSize = 5, |
| ignoreCollocateCase = FALSE, |
| stopwords = c(), |
| tokenizeRegex = "([! )(\uc2\uab,.:?\u201e\u201c\'\"]+|")", |
| oldTable = data.frame(word = rep(NA, 1), frequency = rep(NA, 1)), |
| verbose = TRUE) { |
| word <- NULL # https://stackoverflow.com/questions/8096313/no-visible-binding-for-global-variable-note-in-r-cmd-check |
| frequency <- NULL |
| |
| if (length(snippet) < 1) { |
| dplyr::tibble(word=c(), frequency=c()) |
| } else if (length(snippet) > 1) { |
| log.info(verbose, paste("Joinging", length(snippet), "kwics\n")) |
| for (s in snippet) { |
| oldTable <- snippet2FreqTable( |
| s, |
| leftContextSize = leftContextSize, |
| rightContextSize = rightContextSize, |
| oldTable = oldTable, |
| stopwords = stopwords |
| ) |
| } |
| log.info(verbose, paste("Aggregating", length(oldTable$word), "tokens\n")) |
| oldTable %>% |
| group_by(word) %>% |
| mutate(word = dplyr::case_when(ignoreCollocateCase ~ tolower(word), TRUE ~ word)) %>% |
| summarise(frequency=sum(frequency), .groups = "drop") %>% |
| arrange(desc(frequency)) |
| } else { |
| stopwordsTable <- dplyr::tibble(word=stopwords) |
| match <- |
| str_match( |
| snippet, |
| '<span class="context-left">(<span class="more"></span>)?(.*[^ ]) *</span><span class="match"><mark>.*</mark></span><span class="context-right"> *([^<]*)' |
| ) |
| |
| left <- if(leftContextSize > 0) |
| tail(unlist(str_split(match[1, 3], tokenizeRegex)), leftContextSize) |
| else |
| "" |
| # cat(paste("left:", left, "\n", collapse=" ")) |
| |
| right <- if(rightContextSize > 0) |
| head(unlist(str_split(match[1, 4], tokenizeRegex)), rightContextSize) |
| else |
| "" |
| # cat(paste("right:", right, "\n", collapse=" ")) |
| |
| if(is.na(left) || is.na(right) || length(left) + length(right) == 0) { |
| oldTable |
| } else { |
| table(c(left, right)) %>% |
| dplyr::as_tibble(.name_repair = "minimal") %>% |
| dplyr::rename(word = 1, frequency = 2) %>% |
| dplyr::filter(str_detect(word, '^[:alnum:]+-?[:alnum:]*$')) %>% |
| dplyr::anti_join(stopwordsTable, by="word") %>% |
| dplyr::bind_rows(oldTable) |
| } |
| } |
| } |
| |
| #' Preliminary synsemantic stopwords function |
| #' |
| #' @description |
| #' \Sexpr[results=rd, stage=render]{lifecycle::badge("experimental")} |
| #' |
| #' Preliminary synsemantic stopwords function to be used in collocation analysis. |
| #' |
| #' @details |
| #' Currently only suitable for German. See stopwords package for other languages. |
| #' |
| #' @param ... future arguments for language detection |
| #' |
| #' @family collocation analysis functions |
| #' @return Vector of synsemantic stopwords. |
| #' @export |
| synsemanticStopwords <- function(...) { |
| res <- c( |
| "der", |
| "die", |
| "und", |
| "in", |
| "den", |
| "von", |
| "mit", |
| "das", |
| "zu", |
| "im", |
| "ist", |
| "auf", |
| "sich", |
| "Die", |
| "des", |
| "dem", |
| "nicht", |
| "ein", |
| "eine", |
| "es", |
| "auch", |
| "an", |
| "als", |
| "am", |
| "aus", |
| "Der", |
| "bei", |
| "er", |
| "dass", |
| "sie", |
| "nach", |
| "um", |
| "Das", |
| "zum", |
| "noch", |
| "war", |
| "einen", |
| "einer", |
| "wie", |
| "einem", |
| "vor", |
| "bis", |
| "\u00fcber", |
| "so", |
| "aber", |
| "Eine", |
| "diese", |
| "Diese", |
| "oder" |
| ) |
| return(res) |
| } |
| |
| collocatesQuery <- |
| function(kco, |
| query, |
| vc = "", |
| minOccur = 5, |
| leftContextSize = 5, |
| rightContextSize = 5, |
| searchHitsSampleLimit = 20000, |
| ignoreCollocateCase = FALSE, |
| stopwords = c(), |
| ...) { |
| frequency <- NULL |
| q <- corpusQuery(kco, query, vc, metadataOnly = F, ...) |
| if(q@totalResults == 0) { |
| tibble(word=c(), frequency=c()) |
| } else { |
| q <- fetchNext(q, maxFetch=searchHitsSampleLimit, randomizePageOrder=TRUE) |
| snippet2FreqTable((q@collectedMatches)$snippet, |
| minOccur = minOccur, |
| leftContextSize = leftContextSize, |
| rightContextSize = rightContextSize, |
| ignoreCollocateCase = ignoreCollocateCase, |
| stopwords = stopwords, |
| verbose = kco@verbose) %>% |
| mutate(frequency = frequency * q@totalResults / min(q@totalResults, searchHitsSampleLimit)) %>% |
| filter(frequency >= minOccur) |
| } |
| } |