2022-11-09
Disentanglement of constituent factors of a sensory signal is central to perception and cognition and hence is a critical task for future artificial intelligence systems. In this paper, we present a compute engine capable of efficiently factorizing holographic perceptual representations by exploiting the computation-in-superposition capability of brain-inspired hyperdimensional computing and the intrinsic stochasticity associated with analog in-memory computing based on nanoscale memristive devices. Such an iterative in-memory factorizer is shown to solve at least five orders of magnitude larger problems that cannot be solved otherwise, while also significantly lowering the computational time and space complexity. We present a large-scale experimental demonstration of the factorizer by employing two in-memory compute chips based on phase-change memristive devices. The dominant matrix-vector multiply operations are executed at O(1) thus reducing the computational time complexity to merely the number of iterations. Moreover, we experimentally demonstrate the ability to factorize visual perceptual representations reliably and efficiently.
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从几个培训示例中不断学习新课程，而不忘记以前的旧课程需要一个灵活的体系结构，而不可避免地会增加部分存储，其中可以逐步存储并有效地检索新的示例和类。一个可行的架构解决方案是将固定的深神经网络紧密融合到动态发展的明确记忆（EM）。作为该体系结构的核心，我们提出了一个EM单元，该单元在持续学习操作过程中利用节能中的内存计算（IMC）核心。我们首次证明了EM单元如何使用基于IMC Core上的操作（PCM）上的IMC核心操作，在推理期间进行了多个训练示例，扩展以适应看不见的类并进行相似性搜索。具体而言，通过PCM设备的原位进行性结晶实现了一些编码训练示例的物理叠加。与不断学习的最新完整精确基线软件模型相比，IMC核心上达到的分类精度在1.28％ - 2.5％范围内保持在2.5％之内。在60个旧课程的顶部，新颖的课程（每班只有五个示例）。
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