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https://issues.apache.org/jira/browse/SPARK-17587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15501581#comment-15501581
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Apache Spark commented on SPARK-17587:
--------------------------------------

User 'zero323' has created a pull request for this issue:
https://github.com/apache/spark/pull/15144

> SparseVector __getitem__ should follow __getitem__ contract
> -----------------------------------------------------------
>
>                 Key: SPARK-17587
>                 URL: https://issues.apache.org/jira/browse/SPARK-17587
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, MLlib, PySpark
>    Affects Versions: 1.6.0, 2.0.0
>            Reporter: Maciej Szymkiewicz
>            Priority: Minor
>
> According to {{\_\_getitem\_\_}} 
> [contract|https://docs.python.org/3/reference/datamodel.html#object.__getitem__]:
> {quote}
> if of a value outside the set of indexes for the sequence (after any special 
> interpretation of negative values), {{IndexError}} should be raised.
> {quote}
> This required for example for correct iteration over the structure.
> Right now it throws {{ValueError}} what results in a quite confusing behavior 
> when attempt to iterate over a vector results in a {{ValueError}} due to 
> unterminated iteration:
> {code}
> In [1]: from pyspark.mllib.linalg import SparseVector
> In [2]: list(SparseVector(4, [0], [0]))
> ---------------------------------------------------------------------------
> ValueError                                Traceback (most recent call last)
> <ipython-input-2-147f3bb0a47d> in <module>()
> ----> 1 list(SparseVector(4, [0], [0]))
> /opt/spark-2.0/python/pyspark/mllib/linalg/__init__.py in __getitem__(self, 
> index)
>     803 
>     804         if index >= self.size or index < -self.size:
> --> 805             raise ValueError("Index %d out of bounds." % index)
>     806         if index < 0:
>     807             index += self.size
> ValueError: Index 4 out of bounds.
> {code}



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