ts6.scala

  
 case class PredictionResult(key: String, ts:Timestamp, 
      label: Float, prediction: Float, ratio: Float)


 private def predictXGBBooster(app_id: String, booster: Booster, 
      predictSeq: Seq[FeaturesRecord]):
          Try[Seq[PredictionResult]] = Try {
    val forecastedVal = booster.predict(predictSeq.toDMatrix)
    predictSeq.zip(forecastedVal).map { case (FeaturesRecord(_, ts, _, label), forecast) =>
      PredictionResult(app_id, ts, label, forecast(0), label / forecast(0))
    }
  }