ts3.scala

  private def getForecastDatasets(app_id: String, 
    recordsIterator: Seq[FeaturesRecord]): 
      Try[(Seq[FeaturesRecord], Seq[FeaturesRecord])] = Try {
          val dataPoints = recordsIterator.sortBy(_.ts.getTime)
          // ignoring the last observation as it might be be partial
          val trainSeq = dataPoints.slice(0, dataPoints.length - 3)
          val actualValSeq = dataPoints.slice(dataPoints.length - 3, dataPoints.length - 1)
          (trainSeq, actualValSeq)
  }