Joel Bernstein created SOLR-9193:
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Summary: 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
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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