Top-1 aver. rating nDCG-1 nDCG-3 nDCG-5 <cite>Global PPR</cite> (<cite>Aletras and Stevenson, 2013</cite>) 1 (<cite>Aletras and Stevenson, 2013</cite>) 2.24 --- The DNN (Topic+Caption) model that uses only textual information, obtains a Top-1 Average performance of 1.94.