[jira] [Comment Edited] (SOLR-9193) Add scoreNodes Streaming Expression

["Joel Bernstein (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-9193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362833#comment-15362833 ] 

Joel Bernstein edited comment on SOLR-9193 at 7/5/16 5:36 PM:
--------------------------------------------------------------

Added a new test using the termFreq param and added some error handling. The link above incorporates these changes.

This ticket is pretty close to being ready. I'll do some testing at scale and see if this turns up any issues.


was (Author: joel.bernstein):
Added a new test using the termFreq param and added some error handling. The link above incorporates these changes.

This ticket is pretty close being ready. I'll do some testing at scale and see if this turns up any issues.

> Add scoreNodes Streaming Expression
> -----------------------------------
>
>                 Key: SOLR-9193
>                 URL: https://issues.apache.org/jira/browse/SOLR-9193
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>             Fix For: 6.2
>
>         Attachments: SOLR-9193.patch
>
>
> The scoreNodes Streaming Expression is another *GraphExpression*. It will decorate a gatherNodes expression and us a tf-idf scoring algorithm to score the nodes.
> The gatherNodes expression only gathers nodes and aggregations. This is similar in nature to tf in search ranking, where the number of times a node appears in the traversal represents the tf. But this skews recommendations towards nodes that appear frequently in the index.
> Using the idf for each node we can score each node as a function of tf and idf. This will provide a boost to nodes that appear less frequently in the index. 
> The scoreNodes expression will gather the idf's from the shards for each node emitted by the underlying gatherNodes expression. It will then assign the score to each node. 
> The computed score will be added to each node in the *nodeScore* field. The docFreq of the node across the entire collection will be added to each node in the *docFreq* field. Other streaming expressions can then perform a ranking based on the nodeScore or compute their own score using the nodeFreq.
> proposed syntax:
> {code}
> top(n="10",
>       sort="nodeScore desc",
>       scoreNodes(gatherNodes(...))) 
> {code}



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