Approximate computing is a well-established technique to mitigate power consumption in error-tolerant domains such as image processing and machine learning. When paired with reconfigurable hardware, it enables dynamic adaptability to each specific task with improved power-accuracy trade-offs. In this work, we present a design methodology to enhance the energy and error metrics of a signed multiplier. This novel approach reduces the approximation error by leveraging a statistic-based truncation strategy. Our multiplier features 256 dynamically configurable approximation levels and run-time selection of the result precision. Our technique improves the mean-relative error by up to 34% compared to the zero truncation mechanism. Compared with an exact design, we achieve a maximum of 60.1% power saving for a PSNR of 10.3dB on a 5x5 Sobel filter. Moreover, we reduce the computation energy of LeNet by 31.5%, retaining 89.4% of the original accuracy on FashionMNIST.
TEMET: Truncated REconfigurable Multiplier with Error Tuning / Guella, Flavia; Valpreda, Emanuele; Caon, Michele; Masera, Guido; Martina, Maurizio. - ELETTRONICO. - 1110:(2024), pp. 370-377. (Intervento presentato al convegno International Conference on Applications in Electronics Pervading Industry, Environment and Society tenutosi a Genova, Italy nel 28-29 September 2023) [10.1007/978-3-031-48121-5_53].
TEMET: Truncated REconfigurable Multiplier with Error Tuning
Guella, Flavia;Valpreda, Emanuele;Caon, Michele;Masera, Guido;Martina, Maurizio
2024
Abstract
Approximate computing is a well-established technique to mitigate power consumption in error-tolerant domains such as image processing and machine learning. When paired with reconfigurable hardware, it enables dynamic adaptability to each specific task with improved power-accuracy trade-offs. In this work, we present a design methodology to enhance the energy and error metrics of a signed multiplier. This novel approach reduces the approximation error by leveraging a statistic-based truncation strategy. Our multiplier features 256 dynamically configurable approximation levels and run-time selection of the result precision. Our technique improves the mean-relative error by up to 34% compared to the zero truncation mechanism. Compared with an exact design, we achieve a maximum of 60.1% power saving for a PSNR of 10.3dB on a 5x5 Sobel filter. Moreover, we reduce the computation energy of LeNet by 31.5%, retaining 89.4% of the original accuracy on FashionMNIST.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2983644