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From "Lim Chee Hau (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4886) Example in Machine Learning Quickstart Guide causes error
Date Sat, 22 Oct 2016 16:12:58 GMT
Lim Chee Hau created FLINK-4886:
-----------------------------------

             Summary: Example in Machine Learning Quickstart Guide causes error
                 Key: FLINK-4886
                 URL: https://issues.apache.org/jira/browse/FLINK-4886
             Project: Flink
          Issue Type: Bug
          Components: Documentation
            Reporter: Lim Chee Hau
            Priority: Minor


Under *Loading Data/LibSVM* files section, loading test data with below line will causes error
when execute prediction method *svm.predict(astroTest)*:
{code}
val astroTest: DataSet[LabeledVector] = MLUtils.readLibSVM("/path/to/svmguide1.t")
{code}

Error will be looks like:
{noformat}
Exception in thread "main" java.lang.RuntimeException: There is no PredictOperation defined
for org.apache.flink.ml.classification.SVM which takes a DataSet[org.apache.flink.ml.common.LabeledVector]
as input.
	at org.apache.flink.ml.pipeline.Estimator$$anon$1.predictDataSet(Estimator.scala:113)
	at org.apache.flink.ml.pipeline.Predictor$class.predict(Predictor.scala:59)
	at org.apache.flink.ml.classification.SVM.predict(SVM.scala:131)
	at org.apache.flink.quickstart.BatchJob$.main(BatchJob.scala:116)
	at org.apache.flink.quickstart.BatchJob.main(BatchJob.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
{noformat}

Because *predict* method expects *DataSet\[Vector\]* instead of *DataSet\[LabeledVector\]*,
loading test data with below line will solve the problem:
{code}
val astroTest: DataSet[Vector] = MLUtils.readLibSVM("/path/to/svmguide1.t").map(_.vector)
{code}



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