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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2017/03/23 14:23:41 UTC
[jira] [Commented] (SPARK-20072) Clarify ALS-WR documentation
[ https://issues.apache.org/jira/browse/SPARK-20072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15938415#comment-15938415 ]
Sean Owen commented on SPARK-20072:
-----------------------------------
I don't think those two wordings differ meaningfully? I think small suggestions are OK but weight the value vs overhead of processing these changes. This is pretty borderline.
> Clarify ALS-WR documentation
> ----------------------------
>
> Key: SPARK-20072
> URL: https://issues.apache.org/jira/browse/SPARK-20072
> Project: Spark
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 2.1.0
> Reporter: chris snow
> Priority: Trivial
>
> https://www.mail-archive.com/user@spark.apache.org/msg62590.html
> The documentation for collaborative filtering is as follows:
> ===
> Scaling of the regularization parameter
> Since v1.1, we scale the regularization parameter lambda in solving
> each least squares problem by the number of ratings the user generated
> in updating user factors, or the number of ratings the product
> received in updating product factors.
> ===
> I find this description confusing, probably because I lack a detailed
> understanding of ALS. The wording suggest that the number of ratings
> change ("generated", "received") during solving the least squares.
> This is how I think I should be interpreting the description:
> ===
> Since v1.1, we scale the regularization parameter lambda when solving
> each least squares problem. When updating the user factors, we scale
> the regularization parameter by the total number of ratings from the
> user. Similarly, when updating the product factors, we scale the
> regularization parameter by the total number of ratings for the
> product.
> ===
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