On the Impact of Device-Level Techniques on Energy-Efficiency of Neural Network Accelerators
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Energy-efficiency is a key concern for neural network applications. To alleviate this issue, hardware acceleration using FPGAs or GPUs can provide better energy-efficiency than general-purpose processors. However, further improvement of the energy-efficiency of such accelerators will be extremely beneficial specially to deploy neural network in power-constrained edge computing environments. In this paper, we experimentally explore the potential of device-level energy-efficiency techniques (e.g.,supply voltage underscaling, frequency scaling, and data quantization) for representative off-the-shelf FPGAs compared to GPUs. Frequency scaling in both platforms can improve the power and energy consumption but with performance overhead, e.g.,in GPUs it improves the power consumption and GOPs/J by up to 34 However, leveraging reduced-precision instructions improves power (up to 13 energy (up to 20 reduction in accuracy of neural network accuracy.
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