spark BinaryConfusionMatrix 源码
spark BinaryConfusionMatrix 代码
文件路径：/mllib/src/main/scala/org/apache/spark/mllib/evaluation/binary/BinaryConfusionMatrix.scala
/*
* 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.spark.mllib.evaluation.binary
/**
* Trait for a binary confusion matrix.
*/
private[evaluation] trait BinaryConfusionMatrix {
/** weighted number of true positives */
def weightedTruePositives: Double
/** weighted number of false positives */
def weightedFalsePositives: Double
/** weighted number of false negatives */
def weightedFalseNegatives: Double
/** weighted number of true negatives */
def weightedTrueNegatives: Double
/** weighted number of positives */
def weightedPositives: Double = weightedTruePositives + weightedFalseNegatives
/** weighted number of negatives */
def weightedNegatives: Double = weightedFalsePositives + weightedTrueNegatives
}
/**
* Implementation of [[org.apache.spark.mllib.evaluation.binary.BinaryConfusionMatrix]].
*
* @param count label counter for labels with scores greater than or equal to the current score
* @param totalCount label counter for all labels
*/
private[evaluation] case class BinaryConfusionMatrixImpl(
count: BinaryLabelCounter,
totalCount: BinaryLabelCounter) extends BinaryConfusionMatrix {
/** number of true positives */
override def weightedTruePositives: Double = count.weightedNumPositives
/** number of false positives */
override def weightedFalsePositives: Double = count.weightedNumNegatives
/** number of false negatives */
override def weightedFalseNegatives: Double =
totalCount.weightedNumPositives - count.weightedNumPositives
/** number of true negatives */
override def weightedTrueNegatives: Double =
totalCount.weightedNumNegatives - count.weightedNumNegatives
/** number of positives */
override def weightedPositives: Double = totalCount.weightedNumPositives
/** number of negatives */
override def weightedNegatives: Double = totalCount.weightedNumNegatives
}
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