amount gender_num marital_num
10000  1          1
20000  1          2
1400   2          1

val df1 = df("loan_amount", 'loan_amount.cast("Double")).withColumn("gender_num", 'gender_num.cast("String")).
withColumn("marital_num",  'marital_num.cast("String"))

val labeled = df1.map(row => LabeledPoint(df1.gender_num, Vectors.dense(df1.loan_amount, df1.marital_num)))

val numClasses = 7
val categoricalFeaturesInfo = Map[Int, Int]()
val numTrees = 3 // Use more in practice.
val featureSubsetStrategy = "auto" // Let the algorithm choose.
val impurity = "gini"
val maxDepth = 4
val maxBins = 32

val model = RandomForest.trainClassifier(labeled, categoricalFeaturesInfo,
numTrees, featureSubsetStrategy, impurity, maxDepth, maxBins)

138: error: value gender_num is not a member of org.apache.spark.sql.DataFrame