spark BinaryLabelCounter 源码
spark BinaryLabelCounter 代码
文件路径：/mllib/src/main/scala/org/apache/spark/mllib/evaluation/binary/BinaryLabelCounter.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
/**
* A counter for positives and negatives.
*
* @param weightedNumPositives weighted number of positive labels
* @param weightedNumNegatives weighted number of negative labels
*/
private[evaluation] class BinaryLabelCounter(
var weightedNumPositives: Double = 0.0,
var weightedNumNegatives: Double = 0.0) extends Serializable {
/** Processes a label. */
def +=(label: Double): BinaryLabelCounter = {
// Though we assume 1.0 for positive and 0.0 for negative, the following check will handle
// -1.0 for negative as well.
if (label > 0.5) weightedNumPositives += 1.0 else weightedNumNegatives += 1.0
this
}
/** Processes a label with a weight. */
def +=(label: Double, weight: Double): BinaryLabelCounter = {
// Though we assume 1.0 for positive and 0.0 for negative, the following check will handle
// -1.0 for negative as well.
if (label > 0.5) weightedNumPositives += weight else weightedNumNegatives += weight
this
}
/** Merges another counter. */
def +=(other: BinaryLabelCounter): BinaryLabelCounter = {
weightedNumPositives += other.weightedNumPositives
weightedNumNegatives += other.weightedNumNegatives
this
}
override def clone: BinaryLabelCounter = {
new BinaryLabelCounter(weightedNumPositives, weightedNumNegatives)
}
override def toString: String = s"{numPos: $weightedNumPositives, numNeg: $weightedNumNegatives}"
}
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