-
Notifications
You must be signed in to change notification settings - Fork 2
/
distcomp.functions.r
140 lines (94 loc) · 4.23 KB
/
distcomp.functions.r
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#distortion and compression all functions
#compress with GZIP
compress <- function(original.dir, target.dir) {
lapply(list.files(original.dir), function(x) {
filename <- paste(original.dir, x, sep="")
new.filename <- paste(target.dir, x, sep="")
file.copy(filename, new.filename)
system(paste("gzip", new.filename, sep=" ")) #"gzip"
})
}
#sample random number of sentences
getRandomSample <- function(datadir) {
randomSubset = sapply(list.files(datadir, full.names=TRUE), function (x) readLines(x, n = -1L, encoding = "UTF-8"), simplify = FALSE)
##split into sentences
sentences <- sapply(randomSubset, strsplit, "\\.")
##unlist files, get smallest number of sentences
min.sent <- min(sapply(sentences, function(x) length(unlist(x))))
sample.size = min.sent*0.1 #keep percentage of data
##list of files containing the same percentage of random sentences
randomSubset <- lapply(sentences, function(x) {
corp <- unlist(x)
sample.corp <- sample.int(length(corp), size = sample.size, replace=F)
paste(corp[sample.corp], collapse=" ")
})
return(randomSubset)
}
###############################
#morphological distortion
#delete characters function
drop.chars <- function(wordlist, proportion.keep=0.9) { #proportion.keep=0.9 deletes 10%
splitvec <- unlist(mapply(function(x, y) rep(x, y),
1:length(wordlist), nchar(wordlist)))
characters <- unlist(sapply(wordlist, strsplit, ""))
drop <- sample.int(length(characters), floor(length(characters) *
(1-proportion.keep)))
characters[drop] <- "|"
new.words <- sapply(split(characters, splitvec), paste, collapse="")
result <- sapply(new.words, gsub, pattern="|", replace="", fixed=TRUE)
names(result) <- NULL
return(result)
}
#function to apply drop.chars to whole directory and print to target directory
morphdistort <- function(original.dir, target.dir) {
lapply(list.files(original.dir, full.names = TRUE), function(x){
old.filename <- paste(x, sep="")
from <- original.dir
new.filename <- paste(target.dir, gsub(pattern = from, "", old.filename), sep="") #D:/test/dutch.txt"
corpusfile <- readLines(x, n = -1L, encoding = "UTF-8")
wordcorpfile <- strsplit(corpusfile, " ")
distcorpfile <- paste(drop.chars(unlist(wordcorpfile)), collapse = " ")
write <- function (distcorp, filename = "text.txt") {
output = paste(sapply(distcorp, paste, collapse="\n"), collapse="\n\n")
writeLines(output, con = filename, sep = "\n", useBytes = TRUE)
}
write(distcorpfile, new.filename)
})
}
#######################
#syntactic distortion
#syntactic distortion function
drop.words = function (cont) {
cont2 <- unlist(strsplit(cont, " ")) #split into words
N <- length(cont2)
sample.vec <- sample.int(N, floor(0.9*N), replace=FALSE) #sample.int(N, floor(0.9*N) deletes 10%
sample.vec <- sample.vec[order(sample.vec)]
paste(cont2[sample.vec], collapse=" ")
}
#function to apply drop.words to whole directory and print to target directory
syndistort <- function(original.dir, target.dir) {
lapply(list.files(original.dir, full.names = TRUE), function(x){
old.filename <- paste(x, sep="")
from <- original.dir
new.filename <- paste(target.dir, gsub(pattern = from, "", old.filename), sep="")
corpusfile <- readLines(x, n = -1L, encoding = "UTF-8")
distcorpfile <- paste(drop.words(unlist(corpusfile)), collapse = " ")
write <- function (distcorp, filename = "text.txt") {
output = paste(sapply(distcorp, paste, collapse="\n"), collapse="\n\n")
writeLines(output, con = filename, sep = "\n", useBytes = TRUE)
}
write(distcorpfile, new.filename)
})
}
###############
#writeout
writeout <- function (cont3, filename = "text.txt") {
output <- paste(sapply(cont3, paste, collapse="\n"), collapse="\n\n")
writeLines(output, con = filename, sep = "\n", useBytes = TRUE)
}
###################
#get filesizes
filesizes <- function(directory) {
sapply(list.files(directory, full.names=T),
function(x) file.info(x)$size)
}