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* The DNNs of version 2 (tend to) model stable user characteristics.  
 
* The DNNs of version 2 (tend to) model stable user characteristics.  
 
* The CNNs of version 3 (tend to) model dynamic user characteristics.
 
* The CNNs of version 3 (tend to) model dynamic user characteristics.
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== Generic comment ==
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Generically:
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* optimization function is often "engagement"
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* reward mechanism
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* user history
    
== Individual rights ==
 
== Individual rights ==

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