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https://issues.apache.org/jira/browse/SPARK-8510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600068#comment-14600068
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Peter Aberline commented on SPARK-8510:
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See PR at https://github.com/apache/spark/pull/6995
> NumPy arrays and matrices as values in sequence files
> -----------------------------------------------------
>
> Key: SPARK-8510
> URL: https://issues.apache.org/jira/browse/SPARK-8510
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Reporter: Peter Aberline
> Priority: Minor
>
> Using the DoubleArrayWritable example, I have added support for storing NumPy
> double arrays and matrices as arrays of doubles and nested arrays of doubles
> as value elements of Sequence Files.
> Each value element is a discrete matrix or array. This is useful where you
> have many matrices that you don't want to join into a single Spark Data Frame
> to store in a Parquet file.
> Pandas DataFrames can be easily converted to and from NumPy matrices, so I've
> also added the ability to store the schema-less data from DataFrames and
> Series that contain double data.
> There seems to be demand for this functionality:
> http://mail-archives.us.apache.org/mod_mbox/spark-user/201506.mbox/%3CCAJQK-mg1PUCc_hkV=q3n-01ioq_pkwe1g-c39ximco3khqn...@mail.gmail.com%3E
> I'll be issuing a PR for this shortly.
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