arXiv:2509.26131cs.LG2025-09

针对工业边缘计算,提出按领域优化的超维计算方法,兼顾精度与能效。

Domain-Aware Hyperdimensional Computing for Edge Smart Manufacturing

  • 根据数据类型选择编码方式:信号用非线性随机傅里叶特征,图像用线性随机投影。
  • 在小维度下实现高精度,推理速度比深度学习快6倍以上,训练能耗降低40倍以上。
  • 适合资源受限的工业边缘设备部署,尤其适用于实时质检等场景。

智能制造需要满足严格延迟和能耗约束的本地化智能。超维计算(HDC)通过将数据编码为高维超向量,并使用简单操作进行计算,提供了一种轻量级替代方案。然而,先前研究通常假设超参数与性能之间的定性关系在不同应用中保持稳定。我们对两类代表性任务——数控机床的基于信号的质量监控和激光粉末床熔融的基于图像的缺陷检测——进行了分析,发现该假设不成立。我们系统地研究了编码器类型、投影方差、超向量维度和数据分布对准确率、推理延迟、训练时间和训练能耗的影响。一个形式化复杂度模型解释了编码和相似性计算中的可预测趋势,并揭示了重训练带来的非单调交互作用,导致无法获得闭式最优解。实验表明,信号数据偏好非线性随机傅里叶特征,具有更专一的编码,且在中等维度后准确率趋于饱和;图像数据则偏好线性随机投影,在较小维度下即可达到高准确率,且对样本数量敏感而对维度不敏感。基于这些洞察,我们在多目标约束下优化HDC,所获模型在精度上媲美甚至超过最先进的深度学习和Transformer模型,同时推理速度提升至少6倍,训练能耗降低40倍以上。结果表明,领域感知的HDC编码是必要的,且经调优的HDC为受限硬件上的实时工业AI提供了实用且可扩展的路径。未来工作将探索自适应编码器与超参数选择,扩展至更多制造模态,并在低功耗加速器上验证。

原文摘要 · Abstract (English)

Smart manufacturing requires on-device intelligence that meets strict latency and energy budgets. HyperDimensional Computing (HDC) offers a lightweight alternative by encoding data as high-dimensional hypervectors and computing with simple operations. Prior studies often assume that the qualitative relation between HDC hyperparameters and performance is stable across applications. Our analysis of two representative tasks, signal-based quality monitoring in Computer Numerical Control (CNC) machining and image-based defect detection in Laser Powder Bed Fusion (LPBF), shows that this assumption does not hold. We map how encoder type, projection variance, hypervector dimensionality, and data regime shape accuracy, inference latency, training time, and training energy. A formal complexity model explains predictable trends in encoding and similarity computation and reveals nonmonotonic interactions with retraining that preclude a closed-form optimum. Empirically, signals favor nonlinear Random Fourier Features with more exclusive encodings and saturate in accuracy beyond moderate dimensionality. Images favor linear Random Projection, achieve high accuracy with small dimensionality, and depend more on sample count than on dimensionality. Guided by these insights, we tune HDC under multiobjective constraints that reflect edge deployment and obtain models that match or exceed the accuracy of state-of-the-art deep learning and Transformer models while delivering at least 6x faster inference and more than 40x lower training energy. These results demonstrate that domain-aware HDC encoding is necessary and that tuned HDC offers a practical, scalable path to real-time industrial AI on constrained hardware. Future work will enable adaptive encoder and hyperparameter selection, expand evaluation to additional manufacturing modalities, and validate on low-power accelerators.

边缘计算超维计算智能制造能效优化

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