So let's start by importing required libraries and packages:

package com.packt.ScalaML.FraudDetection

import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.functions._
import org.apache.spark.sql._
import org.apache.spark.h2o._
import _root_.hex.FrameSplitter
import water.Key
import water.fvec.Frame
import _root_.hex.deeplearning.DeepLearning
import _root_.hex.deeplearning.DeepLearningModel.DeepLearningParameters
import _root_.hex.deeplearning.DeepLearningModel.DeepLearningParameters.Activation
import java.io.File
import water.support.ModelSerializationSupport
import _root_.hex.{ ModelMetricsBinomial, ModelMetrics }
import org.apache.spark.h2o._
import scala.reflect.api.materializeTypeTag
import water.support.ModelSerializationSupport
import water.support.ModelMetricsSupport
import _root_.hex.deeplearning.DeepLearningModel
import vegas._
import vegas.sparkExt._
import org.apache.spark.sql.types._