| package org.example.classification |
| |
| import org.apache.predictionio.controller.OptionAverageMetric |
| import org.apache.predictionio.controller.EmptyEvaluationInfo |
| import org.apache.predictionio.controller.Evaluation |
| |
| case class Precision(label: Double) |
| extends OptionAverageMetric[EmptyEvaluationInfo, Query, PredictedResult, ActualResult] { |
| override def header: String = s"Precision(label = $label)" |
| |
| def calculate(query: Query, predicted: PredictedResult, actual: ActualResult) |
| : Option[Double] = { |
| if (predicted.label == label) { |
| if (predicted.label == actual.label) { |
| Some(1.0) // True positive |
| } else { |
| Some(0.0) // False positive |
| } |
| } else { |
| None // Unrelated case for calculating precision |
| } |
| } |
| } |
| |
| object PrecisionEvaluation extends Evaluation { |
| engineMetric = (ClassificationEngine(), Precision(label = 1.0)) |
| } |