[jira] [Assigned] (SOLR-9193) Add the nodeRank 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 reassigned SOLR-9193:
------------------------------------

    Assignee: Joel Bernstein

> Add the nodeRank 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 nodeRank Streaming Expression is another GraphExpression. It will decorate a gatherNodes expression and us a tf-idf ranking algorithm to rank the nodes to support recommendations.
> 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 nodeRank expression will gather the idf's from the shards for each node emitted by the underlying gatherNodes expression. It will then perform the ranking. The underlying gatherNodes expression will perform the aggregation providing the tf.



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