Xusen Yin created SPARK-10133:
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Summary: loadLibSVMFile fails to detect zero-based lines
Key: SPARK-10133
URL: https://issues.apache.org/jira/browse/SPARK-10133
Project: Spark
Issue Type: Bug
Components: MLlib
Affects Versions: 1.4.1
Reporter: Xusen Yin
Priority: Minor
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala#L88
The code wants to assure that each line of vector is one-based and in ascending
order, but it fails since the previous = -1 in the beginning.
In this condition, a libSVM format file that begins with 0-based index could
read in normally, but the size of the according SparseVector is wrong, i.e.
numFeatures - 1.
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