44 research outputs found
A Review of Bayesian Methods in Electronic Design Automation
The utilization of Bayesian methods has been widely acknowledged as a viable
solution for tackling various challenges in electronic integrated circuit (IC)
design under stochastic process variation, including circuit performance
modeling, yield/failure rate estimation, and circuit optimization. As the
post-Moore era brings about new technologies (such as silicon photonics and
quantum circuits), many of the associated issues there are similar to those
encountered in electronic IC design and can be addressed using Bayesian
methods. Motivated by this observation, we present a comprehensive review of
Bayesian methods in electronic design automation (EDA). By doing so, we hope to
equip researchers and designers with the ability to apply Bayesian methods in
solving stochastic problems in electronic circuits and beyond.Comment: 24 pages, a draft version. We welcome comments and feedback, which
can be sent to [email protected]
Nominality Score Conditioned Time Series Anomaly Detection by Point/Sequential Reconstruction
Time series anomaly detection is challenging due to the complexity and
variety of patterns that can occur. One major difficulty arises from modeling
time-dependent relationships to find contextual anomalies while maintaining
detection accuracy for point anomalies. In this paper, we propose a framework
for unsupervised time series anomaly detection that utilizes point-based and
sequence-based reconstruction models. The point-based model attempts to
quantify point anomalies, and the sequence-based model attempts to quantify
both point and contextual anomalies. Under the formulation that the observed
time point is a two-stage deviated value from a nominal time point, we
introduce a nominality score calculated from the ratio of a combined value of
the reconstruction errors. We derive an induced anomaly score by further
integrating the nominality score and anomaly score, then theoretically prove
the superiority of the induced anomaly score over the original anomaly score
under certain conditions. Extensive studies conducted on several public
datasets show that the proposed framework outperforms most state-of-the-art
baselines for time series anomaly detection.Comment: NeurIPS 2023 (https://neurips.cc/virtual/2023/poster/70582
Provable Routing Analysis of Programmable Photonics
Programmable photonic integrated circuits (PPICs) are an emerging technology
recently proposed as an alternative to custom-designed application-specific
integrated photonics. Light routing is one of the most important functions that
need to be realized on a PPIC. Previous literature has investigated the light
routing problem from an algorithmic or experimental perspective, e.g., adopting
graph theory to route an optical signal. In this paper, we also focus on the
light routing problem, but from a complementary and theoretical perspective, to
answer questions about what is possible to be routed. Specifically, we
demonstrate that not all path lengths (defined as the number of tunable basic
units that an optical signal traverses) can be realized on a square-mesh PPIC,
and a rigorous realizability condition is proposed and proved. We further
consider multi-path routing, where we provide an analytical expression on path
length sum, upper bounds on path length mean/variance, and the maximum number
of realizable paths. All of our conclusions are proven mathematically.
Illustrative potential optical applications using our observations are also
presented
A Numerical Method for Analyzing Electromagnetic Scattering Properties of a Moving Conducting Object
The Modality Focusing Hypothesis: On the Blink of Multimodal Knowledge Distillation
Multimodal knowledge distillation (KD) extends traditional knowledge
distillation to the area of multimodal learning. One common practice is to
adopt a well-performed multimodal network as the teacher in the hope that it
can transfer its full knowledge to a unimodal student for performance
improvement. In this paper, we investigate the efficacy of multimodal KD. We
begin by providing two failure cases of it and demonstrate that KD is not a
universal cure in multimodal knowledge transfer. We present the modality Venn
diagram to understand modality relationships and the modality focusing
hypothesis revealing the decisive factor in the efficacy of multimodal KD.
Experimental results on 6 multimodal datasets help justify our hypothesis,
diagnose failure cases, and point directions to improve distillation
performance