Error regarding creating a jar file : Spark Scala - scala

Question

I have a already built in code for logistic regression using Apache spark Scala. Now i am going create a jar file from this using IntelliJ IDEA. But i am getting some errors .
First I imported the data using a CSV file. Then i fitted a logistic regression model. After that i evaluated the model. Finally i need to save the model evaluation results to a text file. I am getting an error when i try to write the model evaluation results to a file.
Here is my jar file :
import org.apache.spark.ml.classification.LogisticRegression
import org.apache.spark.ml.feature.FeatureHasher
import org.apache.spark.{SparkConf, SparkContext}
import org.apache.spark.sql.SparkSession
object class1 {
def main(args: Array[String]): Unit = {
val sc: SparkSession = SparkSession.builder()
.master("local[1]")
.appName("SparkByExample")
.getOrCreate()
val df2 = sc.read.options(Map("inferSchema"->"true","sep"->",","header"->"true")).csv(args(0))
val hasher = new FeatureHasher().setInputCols(Array("x1","x2")).setOutputCol("features")
val transformed = hasher.transform(df2)
val lr = new LogisticRegression().setMaxIter(100).setRegParam(0.1).
setElasticNetParam(0.6).setFeaturesCol("features").setLabelCol("automatic")
val Array(train, test) = transformed.randomSplit(Array(0.9, 0.1))
val lrModel = lr.fit(train)
val result = lrModel.transform(test)
val evaluator = new MulticlassClassificationEvaluator()
evaluator.setLabelCol("automatic")
evaluator.setMetricName("accuracy")
val accuracy = evaluator.evaluate(result)
accuracy.saveAsFiles(args(1))
}
}
my error is as follows :
[error] C:\Spark\src\main\scala\WordCount.scala:39:14: value saveAsFiles is not a member of Double
[error] accuracy.saveAsFiles(args(1))
[error] ^
[error] one error found
[error] (Compile / compileIncremental) Compilation failed
This error implied that ,i cannot use saveAsFiles with a double object.
Can someone help me in understanding how to fix this ?
Thank you

Answer 1

accuracy is no longer a DataFrame. It's just a simple double. You can use regular Scala to save it to a file e.g.
Files.write(..., accuracy.toString)