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From "Nick Pentreath (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-19345) Add doc for "coldStartStrategy" usage in ALS
Date Tue, 28 Feb 2017 14:19:45 GMT

     [ https://issues.apache.org/jira/browse/SPARK-19345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nick Pentreath reassigned SPARK-19345:
--------------------------------------

    Assignee: Nick Pentreath

> Add doc for "coldStartStrategy" usage in ALS
> --------------------------------------------
>
>                 Key: SPARK-19345
>                 URL: https://issues.apache.org/jira/browse/SPARK-19345
>             Project: Spark
>          Issue Type: Documentation
>          Components: ML
>            Reporter: Nick Pentreath
>            Assignee: Nick Pentreath
>
> SPARK-14489 adds the ability to skip {{NaN}} predictions during {{ALS.transform}}. This
can be useful in production scenarios but is particularly useful when trying to use the cross-validation
classes with ALS, since in many cases the test set will have users/items that are not in the
training set, leading to evaluation metrics that are all {{NaN}} and making cross-validation
unusable.
> Add an explanation for the {{coldStartStrategy}} param to the ALS documentation, and
add example code to illustrate the usage.



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