[jira] [Updated] (SOLR-9193) Add the scoreNodes Streaming Expression

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

     [ https://issues.apache.org/jira/browse/SOLR-9193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joel Bernstein updated SOLR-9193:
---------------------------------
    Summary: Add the scoreNodes Streaming Expression  (was: Add the nodeRank Streaming Expression)

> Add the 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
>
> 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 score will be added to each node in the "nscore" field. The underlying gatherNodes expression will perform the aggregation providing the tf.
> proposed syntax:
> {code}
> top(n="5",
>       sort="nscore desc",
>       scoreNodes(gatherNodes(...))) 
> {code}



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