[jira] [Commented] (SPARK-8510) NumPy arrays and matrices as values in sequence files

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-8510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708461#comment-14708461 ] 

Apache Spark commented on SPARK-8510:
-------------------------------------

User 'paberline' has created a pull request for this issue:
https://github.com/apache/spark/pull/8384

> 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-c39XiMCo3KhqngQg@mail.gmail.com%3E
> I'll be issuing a PR for this shortly.



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