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#' Merges list of lemmas back into a pseudo-document
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#'
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#' Merges list of lemmas back into a pseudo-document
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#' @param row A row number form the Elasticizer-generated data frame
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#' @param words String indicating the number of words to keep from each document (maximum document length), 999 indicates the whole document
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#' @param out The elasticizer-generated data frame
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#' @return A documentified string of lemmas, one document at a time
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#' @export
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#' @examples
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#' merger(1, words = '999', out = out)
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#################################################################################################
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#################################### Reconstructing documents from lemmas########################
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#################################################################################################
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## Only merging lemmas for now, feature selection has no impact on junk classification
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merger <- function(row, out = out) {
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df <- out[row,]
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# Mergin lemmas into single string
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lemmas <- paste(str_split(df$`_source.tokens.lemmas`, "\\|")[[1]],collapse = ' ')
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# Replacing $-marked punctuation with their regular forms
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lemmas <- str_replace_all(lemmas," \\$(.+?)", "\\1") %>%
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### Removing numbers and non-words containing numbers
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str_replace_all("\\S*?[0-9@#]+(\\S*?)([:;.,?!\\s])+?", "\\2") %>%
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# Adding extra . at end of string to allow for strings that contain less than 150 words and do not end on ". "
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paste0(.,". ")
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return(lemmas)
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}
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