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#10-fold | |
ctrl <- trainControl(method = "repeatedcv", repeats = 10, | |
classProbs = TRUE, | |
summaryFunction = twoClassSummary) | |
##TRAINING | |
set.seed(5627) | |
orig_fit <- train(UserClass ~ ., data = imbal_train, | |
method = "svmLinear", | |
metric = "ROC", |
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##load functions | |
source('~/experiments/lib/functions.R') | |
##load datasets | |
load('~/experiments/cache/socialMed.training-v1.RData') | |
load('~/experiments/cache/socialMed.validation-v1.RData') | |
load('~/experiments/cache/socialMed.test-v1.RData') | |
prepareFeatures <- function(dataset){ |
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# SVM | |
svm.model <- svm(trainset, as.factor(trainset$label[1:nrow(trainset)]), cost = 100, gamma = 1) | |
svm.pred <- predict(svm.model, testset) | |
#view results | |
testdata$pred <- svm.pred |
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#SMOTE | |
trainset$label <- as.factor(trainset$label) | |
trainset <- SMOTE(label ~ ., trainset, perc.over = 200, perc.under=100) | |
prop.table(table(trainset$label)) |
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prop.table(table(trainset$label)) | |
prop.table(table(testset$label)) |
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#perform split | |
splitIndex <- createDataPartition(data.DTM$label, p = .50, list = FALSE, times = 1) | |
trainset <- data.DTM[ splitIndex,] | |
testset <- data.DTM[-splitIndex,] | |
traindata <- data[ splitIndex,] | |
testdata <- data [-splitIndex,] |
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#convert sparse dtm to data.frame | |
data.DTM <- as.data.frame(as.matrix(sparse_DTM)) | |
#append label column | |
data.DTM$label <- data$label |
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# Create the Document-Term matrix | |
DTM <- DocumentTermMatrix(MyCorpus, control = list(bounds = list(global = c(0, Inf)))) | |
dim(DTM) | |
# Create a sparse matrix to put into SVM | |
sparse_DTM <- sparseMatrix(i = DTM$i, j = DTM$j, x = DTM$v, | |
dims = dim(DTM), | |
dimnames = list(rownames(DTM), colnames(DTM))) |
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# Create the corpus | |
MyCorpus <- VCorpus(VectorSource(data$text), readerControl = list(language = "en")) | |
content(MyCorpus[[1]]) | |
# Some preprocessing | |
MyCorpus <- tm_map(MyCorpus, content_transformer(tolower)) | |
content(MyCorpus[[1]]) |
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library(caret) | |
library(e1071) | |
library(rpart) | |
library(RTextTools) | |
library(tm) | |
library(DMwR) | |
set.seed(1234) |
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