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Processing in-memory (PIM) has shown great potential to accelerate the inference tasks of binarized neural networks (BNNs) by reducing data movement between processing units and memory. However, existing PIM architectures require analog/mixed-signal circuits that do not scale with the CMOS technology. On the contrary, we propose BitNAP (Binarized neural network acceleration with in-memory ThreSholding), which performs optimization at operation, peripheral, and architecture levels for an efficient BNN accelerator. BitNAP supports row-parallel bitwise operations in crossbar memory by exploiting the switching of 1-bit bipolar resistive devices and a unique hybrid tunable thresholding operation. In order to reduce the area overhead of sensing-based operations, BitNAP presents a memory sense amplifier sharing scheme and also, a novel operation pipelining to reduce the latency overhead of sharing. We evaluate the efficiency of BitNAP on the MNIST and ImageNet datasets using popular neural networks. BitNAP is on average 1.24× (10.7×) faster and 185.6× (10.5×) more energy-efficient as compared to the state-of-the-art PIM accelerator for simple (complex) networks.

Implementing binary neural networks in memory with approximate accumulation