RePIM: Joint Exploitation of Activation and Weight Repetitions for In-ReRAM DNN Acceleration

Eliminating redundant computations is a common approach to improve the performance of ReRAM-based DNN accelerators. While existing practical ReRAM-based accelerators eliminate part of the redundant computations by exploiting sparsity in inputs and weights or utilizing weight patterns of DNN models, they fail to identify all the redundancy, resulting in many unnecessary computations. Thus, we propose a practical design, RePIM, that is the first to jointly exploit the repetition of both inputs and weights. Our evaluation shows that RePIM is effective in eliminating unnecessary computations, achieving an average of $15.24\times$ speedup and 96.07% energy savings over the state-of-the-art practical ReRAM-based accelerator.