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[SPARK-20615][ML][TEST] SparseVector.argmax throws IndexOutOfBoundsEx…
…ception ## What changes were proposed in this pull request? Added a check for for the number of defined values. Previously the argmax function assumed that at least one value was defined if the vector size was greater than zero. ## How was this patch tested? Tests were added to the existing VectorsSuite to cover this case. Author: Jon McLean <jon.mclean@atsid.com> Closes apache#17877 from jonmclean/vectorArgmaxIndexBug.
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