| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.predictionio.examples.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)) |
| } |
