ConformalHDC: Uncertainty-Aware Hyperdimensional Computing with Application to Neural Decoding

TL;DR

ConformalHDC enhances hyperdimensional computing by integrating conformal prediction to provide uncertainty quantification, improving robustness and accuracy in neural decoding tasks with rigorous statistical guarantees.

Contribution

It introduces a novel framework combining conformal prediction with HDC, offering both set-valued and point predictions with distribution-free coverage guarantees.

Findings

Improves robustness to outliers and non-conforming inputs.

Provides rigorous uncertainty estimates in neural decoding.

Achieves accurate stimulus decoding with uncertainty awareness.

Abstract

Hyperdimensional Computing (HDC) offers a computationally efficient paradigm for neuromorphic learning. Yet, it lacks rigorous uncertainty quantification, leading to open decision boundaries and, consequently, vulnerability to outliers, adversarial perturbations, and out-of-distribution inputs. To address these limitations, we introduce ConformalHDC, a unified framework that combines the statistical guarantees of conformal prediction with the computational efficiency of HDC. For this framework, we propose two complementary variations. First, the set-valued formulation provides finite-sample, distribution-free coverage guarantees. Using carefully designed conformity scores, it forms enclosed decision boundaries that improve robustness to non-conforming inputs. Second, the point-valued formulation leverages the same conformity scores to produce a single prediction when desired, potentially improving accuracy over traditional HDC by accounting for class interactions. We demonstrate the broad applicability of the proposed framework through evaluations on multiple real-world datasets. In particular, we apply our method to the challenging problem of decoding non-spatial stimulus information from the spiking activity of hippocampal neurons recorded as subjects performed a sequence memory task. Our results show that ConformalHDC not only accurately decodes the stimulus information represented in the neural activity data, but also provides rigorous uncertainty estimates and correctly abstains when presented with data from other behavioral states. Overall, these capabilities position the framework as a reliable, uncertainty-aware foundation for neuromorphic computing.