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https://issues.apache.org/jira/browse/SPARK-20214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-20214:
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Assignee: Apache Spark
> pyspark.mllib SciPyTests test_serialize
> ---------------------------------------
>
> Key: SPARK-20214
> URL: https://issues.apache.org/jira/browse/SPARK-20214
> Project: Spark
> Issue Type: Bug
> Components: ML, MLlib, PySpark, Tests
> Affects Versions: 2.0.2, 2.1.1, 2.2.0
> Reporter: Joseph K. Bradley
> Assignee: Apache Spark
>
> I've seen a few failures of this line:
> https://github.com/apache/spark/blame/402bf2a50ddd4039ff9f376b641bd18fffa54171/python/pyspark/mllib/tests.py#L847
> It converts a scipy.sparse.lil_matrix to a dok_matrix and then to a
> pyspark.mllib.linalg.Vector. The failure happens in the conversion to a
> vector and indicates that the dok_matrix is not returning its values in
> sorted order. (Actually, the failure is in _convert_to_vector, which converts
> the dok_matrix to a csc_matrix and then passes the CSC data to the MLlib
> Vector constructor.) Here's the stack trace:
> {code}
> Traceback (most recent call last):
> File "/home/jenkins/workspace/python/pyspark/mllib/tests.py", line 847, in
> test_serialize
> self.assertEqual(sv, _convert_to_vector(lil.todok()))
> File "/home/jenkins/workspace/python/pyspark/mllib/linalg/__init__.py",
> line 78, in _convert_to_vector
> return SparseVector(l.shape[0], csc.indices, csc.data)
> File "/home/jenkins/workspace/python/pyspark/mllib/linalg/__init__.py",
> line 556, in __init__
> % (self.indices[i], self.indices[i + 1]))
> TypeError: Indices 3 and 1 are not strictly increasing
> {code}
> This seems like a bug in _convert_to_vector, where we really should check
> {{csc_matrix.has_sorted_indices}} first.
> I haven't seen this bug in pyspark.ml.linalg, but it probably exists there
> too.
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