我正在尝试使用Spark ML KMeans分析和聚类芝加哥犯罪数据集。以下是摘录
case class ChicCase(ID: Long, Case_Number: String, Date: String, Block: String, IUCR: String, Primary_Type: String, Description: String, Location_description: String, Arrest: Boolean, Domestic: Boolean, Beat: Int, District: Int, Ward: Int, Community_Area: Int, FBI_Code: String, X_Coordinate: Int, Y_Coordinate: Int, Year: Int, Updated_On: String, Latitude: Double, Longitude: Double, Location: String)
val city = spark.read.option("header", true).option("inferSchema", true).csv("/chicago_city/Crimes_2001_to_present_2").as[ChicCase]
val data = city.drop("ID", "Case_Number", "Date", "Block", "IUCR", "Primary_Type", "Description", "Location_description", "Arrest", "Domestic", "FBI_Code", "Year", "Location", "Updated_On")
val kmeans = new KMeans
kmeans.setK(10).setSeed(1L)
val model = kmeans.fit(data)
但是这会抛出以下异常
org.apache.spark.sql.AnalysisException: cannot resolve '`features`' given input columns: [Ward, Longitude, X_Coordinate, Beat, Latitude, District, Y_Coordinate, Community_Area];
at org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:42)
at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:77)
at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:74)
at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:301)
at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:301)
at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:69)
at org.apache.spark.sql.catalyst.trees.TreeNode.transformUp(TreeNode.scala:300)
at org.apache.spark.sql.catalyst.plans.QueryPlan.transformExpressionUp$1(QueryPlan.scala:190)
at org.apache.spark.sql.catalyst.plans.QueryPlan.org$apache$spark$sql$catalyst$plans$QueryPlan$$recursiveTransform$2(QueryPlan.scala:200)
at org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$org$apache$spark$sql$catalyst$plans$QueryPlan$$recursiveTransform$2$1.apply(QueryPlan.scala:204)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at org.apache.spark.sql.catalyst.plans.QueryPlan.org$apache$spark$sql$catalyst$plans$QueryPlan$$recursiveTransform$2(QueryPlan.scala:204)
at org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$5.apply(QueryPlan.scala:209)
at org.apache.spark.sql.catalyst.trees.TreeNode.mapProductIterator(TreeNode.scala:179)
at org.apache.spark.sql.catalyst.plans.QueryPlan.transformExpressionsUp(QueryPlan.scala:209)
at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1.apply(CheckAnalysis.scala:74)
at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1.apply(CheckAnalysis.scala:67)
at org.apache.spark.sql.catalyst.trees.TreeNode.foreachUp(TreeNode.scala:126)
at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$class.checkAnalysis(CheckAnalysis.scala:67)
at org.apache.spark.sql.catalyst.analysis.Analyzer.checkAnalysis(Analyzer.scala:58)
at org.apache.spark.sql.execution.QueryExecution.assertAnalyzed(QueryExecution.scala:49)
at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)
at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$withPlan(Dataset.scala:2589)
at org.apache.spark.sql.Dataset.select(Dataset.scala:969)
at org.apache.spark.ml.clustering.KMeans.fit(KMeans.scala:307) ... 90 elided
数据类型为Int或Double。可能是什么问题?
答案 0 :(得分:2)
在spark ml数据框架API中,应使用带有要素名称的 VectorAssembler 将所有要素列收集为一个列。当你适合模型时,它会尝试找到 features 列,在你的情况下,没有这样的列,这就是为什么Exception:无法解析' {{1} }'给定输入列:
features