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https://issues.apache.org/jira/browse/SPARK-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14340539#comment-14340539
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Apache Spark commented on SPARK-4587:
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User 'jkbradley' has created a pull request for this issue:
https://github.com/apache/spark/pull/4816
> Model export/import
> -------------------
>
> Key: SPARK-4587
> URL: https://issues.apache.org/jira/browse/SPARK-4587
> Project: Spark
> Issue Type: New Feature
> Components: ML, MLlib
> Reporter: Xiangrui Meng
> Assignee: Joseph K. Bradley
> Priority: Critical
>
> This is an umbrella JIRA for one of the most requested features on the user
> mailing list. Model export/import can be done via Java serialization. But it
> doesn't work for models stored distributively, e.g., ALS and LDA. Ideally, we
> should provide save/load methods to every model. PMML is an option but it has
> its limitations. There are couple things we need to discuss: 1) data format,
> 2) how to preserve partitioning, 3) data compatibility between versions and
> language APIs, etc.
> UPDATE: [Design doc for model import/export |
> https://docs.google.com/document/d/1kABFz1ssKJxLGMkboreSl3-I2CdLAOjNh5IQCrnDN3g/edit?usp=sharing]
> This document sketches machine learning model import/export plans, including
> goals, an API, and development plans.
> UPDATE: As in the design doc, we plan to support:
> * Our own Spark-specific format.
> ** This is needed to (a) support distributed models and (b) get model
> import/export support into Spark quickly (while avoiding the complexity of
> PMML).
> * PMML
> ** This is needed since it is the most commonly used format in industry.
> This JIRA will be for the internal Spark-specific format described in the
> design doc. Parallel JIRAs will cover PMML.
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