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# WhatsHot Information

WhatsHot information is the most relevant information that is available for the clusters that HPE IDOL Server identifies in your snapshot. Unlike WhatsNew information, this is not restricted to new information, which means that it can follow the progress of particular news items over time.

You can cluster WhatsHot information from a snapshot and use the HPE IDOL HotNews portlet to display this information in a portal. You can also generate a 2-D map from WhatsHot information and display it in a portal using the HPE IDOL 2DMap portlet.

The 2-D map gives a visualization of the similarities and difference between clusters. HPE IDOL Server uses a dimensionality reduction algorithm to maintain intercluster similarity measures so that similar clusters are close together and very different clusters are not close together. HPE IDOL Server uses the distribution of documents throughout the space, along with nonlinear remapping, to create the landscape.

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