Github user WeichenXu123 commented on the issue: https://github.com/apache/spark/pull/14265 @srowen I check the ml.python.MLSerde and it support SparseMatrix pickler and at python side the SparseMatrix constructor also match the pickler. So I think the `_picklable_classes` forgot to add `SparkMatrix`, or there is some other reason not to add SparseMatrix to the class list ?
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