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[SPARK-19158][SPARKR][EXAMPLES] Fix ml.R example fails due to lack of e1071 package. #16548

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[SPARK-19158][SPARKR][EXAMPLES] Fix ml.R example fails due to lack of e1071 package. #16548

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15 changes: 7 additions & 8 deletions examples/src/main/r/ml/ml.R
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Original file line number Diff line number Diff line change
Expand Up @@ -49,17 +49,16 @@ unlink(modelPath)

############################ fit models with spark.lapply #####################################
# Perform distributed training of multiple models with spark.lapply
costs <- exp(seq(from = log(1), to = log(1000), length.out = 5))
train <- function(cost) {
stopifnot(requireNamespace("e1071", quietly = TRUE))
model <- e1071::svm(Species ~ ., data = iris, cost = cost)
summary(model)
algorithms <- c("Hartigan-Wong", "Lloyd", "MacQueen")
train <- function(algorithm) {
model <- kmeans(x = iris[1:4], centers = 3, algorithm = algorithm)
model$withinss
}

model.summaries <- spark.lapply(costs, train)
model.withinss <- spark.lapply(algorithms, train)

# Print the summary of each model
print(model.summaries)
# Print the within-cluster sum of squares for each model
print(model.withinss)

# Stop the SparkSession now
sparkR.session.stop()