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https://issues.apache.org/jira/browse/MAHOUT-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977314#comment-13977314
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Dmitriy Lyubimov commented on MAHOUT-1518:
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bq. Since there is drm inside the object it's a matrix in every sense that a
drm is, right?
No. That's actually what i am trying to avoid, i.e. introducing derived types
and saying they somehow fit as an algebraic operand thruout. It is not entirely
impossible, but it would complicate things a lot and makes it fairly hard to
express in simple set of concepts about matrix transformations. As we know, R
didn't even attempt to do that -- so we don't want to go that rat hole either.
More likely we may create specific constructs such as dictionaries to help
individual pipelines at "in" and "out" ends.
> Preprocessing for collaborative filtering with the Scala DSL
> ------------------------------------------------------------
>
> Key: MAHOUT-1518
> URL: https://issues.apache.org/jira/browse/MAHOUT-1518
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
> Fix For: 1.0
>
> Attachments: MAHOUT-1518.patch
>
>
> The aim here is to provide some easy-to-use machinery to enable the usage of
> the new Cooccurrence Analysis code from MAHOUT-1464 with datasets represented
> as follows in a CSV file with the schema _timestamp, userId, itemId, action_,
> e.g.
> {code}
> timestamp1, userIdString1, itemIdString1, “view"
> timestamp2, userIdString2, itemIdString1, “like"
> {code}
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