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We consider a system model in which several energy harvesting (EH) unmanned aerial vehicles (UAVs), often known as drones, are deployed with device-to-device (D2D) communication networks. For the considered system model, we formulate an optimization problem that aims to find an optimal transmit power vector which maximizes the sum rate of the D2D network while also meets the minimum energy requirements of the UAVs. Because of the nature of the system model, it is necessary to deliver solutions in real time i.e., within a channel coherence time. As a result, conventional non-data-driven optimization methods are inapplicable, as either their run-time overheads are prohibitively expensive or their solutions are significantly suboptimal. In this paper, we address this problem by proposing a deep unsupervised learning (DUL) based hybrid scheme in which a deep neural network (DNN) is complemented …