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https://issues.apache.org/jira/browse/MAHOUT-354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851813#action_12851813
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Sean Owen commented on MAHOUT-354:
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I understand your point, though I'm reluctant to express the output this way.
There is one, ordered list of recommendations per user. Expressing it this way
says they are effectively a "set" of unordered and unrelated recommendations,
which isn't quite right.
It's also not guaranteed that recommendations for one user will appear together
this way, which could be confusing.
Does it make anything meaningfully easier to parse? it's already
human-readable, and not a binary format.
> make the output of RecommenderJob more readable
> -----------------------------------------------
>
> Key: MAHOUT-354
> URL: https://issues.apache.org/jira/browse/MAHOUT-354
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
>
> now the output of RecommenderMapper as following:
> output.collect(userID, new RecommendedItemsWritable(recommendations));
> Can we change it more readable like following:
> private final Text user = new Text();
> private final Text recomScore = new Text();
> private static final String FIELD_SEPERATOR = ",";
> for (RecommendedItem recommendation : recommendations)
> {
> user.set(String.valueOf(userId));
> recomScore.set(recommendation.getItemID() + FIELD_SEPERATOR +
> recommendation.getValue());
> output.collect(user, recomScore);
> }
> then user can read and verify the result more convenient and need not depend
> on the mahout API
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