[jira] Commented: (MAHOUT-429) Add timestamp info to DataModel

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883112#action_12883112 ] 

Sean Owen commented on MAHOUT-429:
----------------------------------

I'm working on this but having some trouble implementing FileDataModel cleanly, which is already fairly complex. In particular it needs to support lines like:

userID,itemID
userID,itemID,timestamp
userID,itemID,pref
userID,itemID,pref,timestamp

and in addition still needs to support "update" semantics with some way of communicating deletes.

I don't think this can be done without changing the expected file input, which isn't great. I'll think through the simplest way to handle this.

In the meantime I'd point out that it's entirely possible to load, store and use this info outside the framework. That was the original intent anyway. I'd do that for now -- nothing prevents this.

> Add timestamp info to DataModel
> -------------------------------
>
>                 Key: MAHOUT-429
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-429
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.3
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>             Fix For: 0.4
>
>
> Per discussion on mailing list: would be good to add timestamp information to DataModel.

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