Cluster Results

If you perform a Query, Suggest, or SuggestOnText query, you can set Cluster to True in the action to cluster the results that the query produces.

HPE IDOL Server returns an <autn:cluster> field for each result that contains the ID of the cluster into which the result has been grouped. ID 1 is given to the cluster that forms around the most relevant result document. After this cluster forms, the cluster with the ID 2 forms around the most relevant of the remaining results, and so on.

The ClusterThreshold parameter in the HPE IDOL Server configuration file sets the percentage relevance that results must have to each other to group them in one cluster.

For example:

action=Query&Text=cats&Cluster=True

HPE IDOL Server clusters the results of the query above, and returns the ID of the cluster that each result belongs to in an <autn:cluster> field:

<autn:hit>
    <autn:reference>http://example.wikipedia.org/wiki/Big Cat Rescue</autn:reference> 
    <autn:id>595644</autn:id> 
    <autn:section>0</autn:section> 
    <autn:weight>88.04</autn:weight> 
    <autn:cluster>1</autn:cluster> 
    <autn:clustertitle>Big Cat Rescue, Easy Street</autn:clustertitle> 
    <autn:links>CAT</autn:links>
    <autn:database>Wikipedia</autn:database>
    <autn:title>Big Cat Rescue</autn:title>
</autn:hit>
<autn:hit>
    <autn:reference>http://example.wikipedia.org/wiki/The Cat in the Hat</autn:reference> 
    <autn:id>229422</autn:id>
    <autn:section>1</autn:section> 
    <autn:weight>86.93</autn:weight>
    <autn:cluster>2</autn:cluster> 
    <autn:clustertitle>Allan, ballad, Hat, Krinklebine</autn:clustertitle>
    <autn:links>CAT</autn:links>
    <autn:database>Wikipedia</autn:database>
    <autn:title>The Cat in the Hat</autn:title>
</autn:hit>
<autn:hit>
    <autn:reference>http://example.wikipedia.org/wiki/The Cat in the Hat</autn:reference>
    <autn:id>229421</autn:id>
    <autn:section>0</autn:section>
    <autn:weight>86.93</autn:weight>
    <autn:cluster>3</autn:cluster>
    <autn:clustertitle>sight vocabulary, Cat, Hat, Seuss</autn:clustertitle>
    <autn:links>CAT</autn:links>
    <autn:database>Wikipedia</autn:database>
    <autn:title>The Cat in the Hat</autn:title>
</autn:hit>
<autn:hit>
    <autn:reference>http://example.wikipedia.org/wiki/Cat</autn:reference> 
    <autn:id>56711</autn:id>
    <autn:section>18</autn:section>
    <autn:weight>86.93</autn:weight> 
    <autn:cluster>4</autn:cluster> 
    <autn:clustertitle>breeds Polydactyl cat, Halloween, List, pets</autn:clustertitle>
    <autn:links>CAT</autn:links> 
    <autn:database>Wikipedia</autn:database>
    <autn:title>Cat</autn:title> 
</autn:hit>

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