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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4886) Example in Machine Learning Quickstart Guide causes error
Date Sat, 22 Oct 2016 16:15:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15598091#comment-15598091
] 

ASF GitHub Bot commented on FLINK-4886:
---------------------------------------

GitHub user ch33hau opened a pull request:

    https://github.com/apache/flink/pull/2682

    [FLINK-4886] [docs] Update ML quickstart loading svm test data example

    Thanks for contributing to Apache Flink. Before you open your pull request, please take
the following check list into consideration.
    If your changes take all of the items into account, feel free to open your pull request.
For more information and/or questions please refer to the [How To Contribute guide](http://flink.apache.org/how-to-contribute.html).
    In addition to going through the list, please provide a meaningful description of your
changes.
    
    - [X] General
      - The pull request references the related JIRA issue ("[FLINK-4886] Example in Machine
Learning Quickstart Guide causes error")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the JIRA id)
    
    - [X] Documentation
      - Documentation has been added for new functionality
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      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis build has passed
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ch33hau/flink update-ml-quickstart

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/2682.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2682
    
----
commit de49683e7e4724e7db8e7a90aa17701d11cf4794
Author: ch33hau <ch33hau@gmail.com>
Date:   2016-10-22T16:13:52Z

    [FLINK-4886] [docs] Update ML quickstart loading svm test data example

----


> 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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