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[MINOR][ML] Refactor clustering summary.
## What changes were proposed in this pull request? Abstract ```ClusteringSummary``` from ```KMeansSummary```, ```GaussianMixtureSummary``` and ```BisectingSummary```, and eliminate duplicated pieces of code. ## How was this patch tested? Existing tests. Author: Yanbo Liang <[email protected]> Closes apache#15555 from yanboliang/clustering-summary.
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mllib/src/main/scala/org/apache/spark/ml/clustering/ClusteringSummary.scala
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/* | ||
* 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. | ||
*/ | ||
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package org.apache.spark.ml.clustering | ||
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import org.apache.spark.annotation.Experimental | ||
import org.apache.spark.sql.{DataFrame, Row} | ||
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/** | ||
* :: Experimental :: | ||
* Summary of clustering algorithms. | ||
* | ||
* @param predictions [[DataFrame]] produced by model.transform(). | ||
* @param predictionCol Name for column of predicted clusters in `predictions`. | ||
* @param featuresCol Name for column of features in `predictions`. | ||
* @param k Number of clusters. | ||
*/ | ||
@Experimental | ||
class ClusteringSummary private[clustering] ( | ||
@transient val predictions: DataFrame, | ||
val predictionCol: String, | ||
val featuresCol: String, | ||
val k: Int) extends Serializable { | ||
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/** | ||
* Cluster centers of the transformed data. | ||
*/ | ||
@transient lazy val cluster: DataFrame = predictions.select(predictionCol) | ||
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/** | ||
* Size of (number of data points in) each cluster. | ||
*/ | ||
lazy val clusterSizes: Array[Long] = { | ||
val sizes = Array.fill[Long](k)(0) | ||
cluster.groupBy(predictionCol).count().select(predictionCol, "count").collect().foreach { | ||
case Row(cluster: Int, count: Long) => sizes(cluster) = count | ||
} | ||
sizes | ||
} | ||
} |
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