[jira] [Created] (SPARK-21723) Can't write LibSVM - key not found: numFeatures

["Jan Vršovský (JIRA)" <ji...@apache.org>]

Jan Vršovský created SPARK-21723:
------------------------------------

             Summary: Can't write LibSVM - key not found: numFeatures
                 Key: SPARK-21723
                 URL: https://issues.apache.org/jira/browse/SPARK-21723
             Project: Spark
          Issue Type: Bug
          Components: Input/Output, ML
    Affects Versions: 2.2.0, 2.3.0
            Reporter: Jan Vršovský


Writing a dataset to LibSVM format raises an exception

{{java.util.NoSuchElementException: key not found: numFeatures}}

Happens only when the dataset was NOT read from a LibSVM format before (because otherwise numFeatures is in its metadata). Steps to reproduce:

{{import org.apache.spark.ml.linalg.Vectors
val rawData = Seq((1.0, Vectors.sparse(3, Seq((0, 2.0), (1, 3.0)))),
                  (4.0, Vectors.sparse(3, Seq((0, 5.0), (2, 6.0)))))
val dfTemp = spark.sparkContext.parallelize(rawData).toDF("label", "features")
dfTemp.coalesce(1).write.format("libsvm").save("...filename...")}}

PR with a fix and unit test is ready.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org