我试图使用svmwithsgd来训练我的模型,但是在尝试访问我的训练时遇到了classcastexception。我的train\uDataframe架构如下所示:
train_data.printSchema
root
|-- label: string (nullable = true)
|-- features: vector (nullable = true)
|-- label_index: double (nullable = false)
我创建了一个labeledpoint rdd来在svnwithsgd上使用它
val targetInd = train_data.columns.indexOf("label_index")`
val featInd = Array("features").map(train_data.columns.indexOf(_))
val train_lp = train_data.rdd.map(r => LabeledPoint( r.getDouble(targetInd),
Vectors.dense(featInd.map(r.getDouble(_)).toArray)))
但是当我打电话给svmwithsgd.train(train\u lp,numiterations)
它给了我:
Driver stacktrace:
at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGSched
uler$$failJobAndIndependentStages(DAGScheduler.scala:1889)
at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGSche
duler.scala:1877)
at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGSche
duler.scala:1876)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:
59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1876)
at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.appl
y(DAGScheduler.scala:926)
at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.appl
y(DAGScheduler.scala:926)
at scala.Option.foreach(Option.scala:257)
at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.sc
ala:926)
at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGSche
duler.scala:2110)
at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGSchedu
ler.scala:2059)
at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGSchedu
ler.scala:2048)
at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:49)
at org.apache.spark.scheduler.DAGScheduler.runJob(DAGScheduler.scala:737)
at org.apache.spark.SparkContext.runJob(SparkContext.scala:2061)
at org.apache.spark.SparkContext.runJob(SparkContext.scala:2082)
at org.apache.spark.SparkContext.runJob(SparkContext.scala:2101)
at org.apache.spark.rdd.RDD$$anonfun$take$1.apply(RDD.scala:1364)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:1
51)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:1
12)
at org.apache.spark.rdd.RDD.withScope(RDD.scala:363)
at org.apache.spark.rdd.RDD.take(RDD.scala:1337)
at org.apache.spark.rdd.RDD$$anonfun$first$1.apply(RDD.scala:1378)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:1
51)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:1
12)
at org.apache.spark.rdd.RDD.withScope(RDD.scala:363)
at org.apache.spark.rdd.RDD.first(RDD.scala:1377)
at org.apache.spark.mllib.regression.GeneralizedLinearAlgorithm.generateInitia
lWeights(GeneralizedLinearAlgorithm.scala:204)
at org.apache.spark.mllib.regression.GeneralizedLinearAlgorithm.run(Generalize
dLinearAlgorithm.scala:234)
at org.apache.spark.mllib.classification.SVMWithSGD$.train(SVM.scala:217)
at org.apache.spark.mllib.classification.SVMWithSGD$.train(SVM.scala:255)
... 55 elided
Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to org.
apache.spark.mllib.linalg.Vector
我的train\u数据是基于标签(文件名)和特征(表示图像特征的json文件)创建的。
1条答案
按热度按时间mqxuamgl1#
试着用这个-
架构
将代码修改为-