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 mukhopadhyay


Intelligent Sensing-to-Action for Robust Autonomy at the Edge: Opportunities and Challenges

arXiv.org Artificial Intelligence

Autonomous edge computing in robotics, smart cities, and autonomous vehicles relies on the seamless integration of sensing, processing, and actuation for real-time decision-making in dynamic environments. At its core is the sensing-to-action loop, which iteratively aligns sensor inputs with computational models to drive adaptive control strategies. These loops can adapt to hyper-local conditions, enhancing resource efficiency and responsiveness, but also face challenges such as resource constraints, synchronization delays in multi-modal data fusion, and the risk of cascading errors in feedback loops. This article explores how proactive, context-aware sensing-to-action and action-to-sensing adaptations can enhance efficiency by dynamically adjusting sensing and computation based on task demands, such as sensing a very limited part of the environment and predicting the rest. By guiding sensing through control actions, action-to-sensing pathways can improve task relevance and resource use, but they also require robust monitoring to prevent cascading errors and maintain reliability. Multi-agent sensing-action loops further extend these capabilities through coordinated sensing and actions across distributed agents, optimizing resource use via collaboration. Additionally, neuromorphic computing, inspired by biological systems, provides an efficient framework for spike-based, event-driven processing that conserves energy, reduces latency, and supports hierarchical control--making it ideal for multi-agent optimization. This article highlights the importance of end-to-end co-design strategies that align algorithmic models with hardware and environmental dynamics and improve cross-layer interdependencies to improve throughput, precision, and adaptability for energy-efficient edge autonomy in complex environments.


A Dynamical Systems-Inspired Pruning Strategy for Addressing Oversmoothing in Graph Neural Networks

arXiv.org Artificial Intelligence

Graph Neural Networks (GNNs) Wu et al. [2020] have emerged as an important component in contemporary machine learning, excelling in tasks that require the analysis of graph-structured data. Their capacity to model complex relationships between nodes and edges has driven their widespread application in fields ranging from molecular property prediction Gilmer et al. [2017], Reiser et al. [2022], Gasteiger et al. [2021] to social network analysis Kipf and Welling [2017], Fan et al. [2019] and recommendation systems Ying et al. [2018]. However, one significant challenge that GNNs face is the phenomenon known as oversmoothing. As the depth of the GNN increases, node representations tend to homogenize, leading to a decline in the network's ability to differentiate between nodes, ultimately impairing performance Li et al. [2018]. Oversmoothing in GNNs has been extensively studied, with early works such as Li et al. [2018] identifying it as a critical issue in deep architectures like Graph Convolutional Networks (GCNs). Subsequent theoretical analyses Oono and Suzuki [2020], Cai and Wang [2020], Keriven [2022], Chen et al. [2020], Xu et al. [2019] have confirmed that oversmoothing is a fundamental problem in message-passing architectures, where repeated aggregation leads to the homogenization of node features. To counteract this, various strategies have been proposed, such as residual connections and skip connections Li et al. [2019], Xu et al. [2018], normalization methods Ba et al. [2016], Ioffe and Szegedy [2015], Zhou et al. [2020], and attention mechanisms Velickovic et al. [2018]. However, these approaches primarily involve architectural modifications that do not fundamentally address the propagation dynamics responsible for oversmoothing.


A Deep Learning Approach to Detect Lean Blowout in Combustion Systems

arXiv.org Artificial Intelligence

Lean combustion is environment friendly with low NOx emissions and also provides better fuel efficiency in a combustion system. However, approaching towards lean combustion can make engines more susceptible to lean blowout. Lean blowout (LBO) is an undesirable phenomenon that can cause sudden flame extinction leading to sudden loss of power. During the design stage, it is quite challenging for the scientists to accurately determine the optimal operating limits to avoid sudden LBO occurrence. Therefore, it is crucial to develop accurate and computationally tractable frameworks for online LBO detection in low NOx emission engines. To the best of our knowledge, for the first time, we propose a deep learning approach to detect lean blowout in combustion systems. In this work, we utilize a laboratory-scale combustor to collect data for different protocols. We start far from LBO for each protocol and gradually move towards the LBO regime, capturing a quasi-static time series dataset at each condition. Using one of the protocols in our dataset as the reference protocol and with conditions annotated by domain experts, we find a transition state metric for our trained deep learning model to detect LBO in the other test protocols. We find that our proposed approach is more accurate and computationally faster than other baseline models to detect the transitions to LBO. Therefore, we recommend this method for real-time performance monitoring in lean combustion engines.


Designing Emergency Response Pipelines : Lessons and Challenges

arXiv.org Artificial Intelligence

Emergency response to incidents such as accidents, crimes, and fires is a major problem faced by communities. Emergency response management comprises of several stages and sub-problems like forecasting, resource allocation, and dispatch. The design of principled approaches to tackle each problem is necessary to create efficient emergency response management (ERM) pipelines. Over the last six years, we have worked with several first responder organizations to design ERM pipelines. In this paper, we highlight some of the challenges that we have identified and lessons that we have learned through our experience in this domain. Such challenges are particularly relevant for practitioners and researchers, and are important considerations even in the design of response strategies to mitigate disasters like floods and earthquakes.


Breiman's "Two Cultures" Revisited and Reconciled

arXiv.org Artificial Intelligence

In a landmark paper published in 2001, Leo Breiman described the tense standoff between two cultures of data modeling: parametric statistical and algorithmic machine learning. The cultural division between these two statistical learning frameworks has been growing at a steady pace in recent years. What is the way forward? It has become blatantly obvious that this widening gap between "the two cultures" cannot be averted unless we find a way to blend them into a coherent whole. This article presents a solution by establishing a link between the two cultures. Through examples, we describe the challenges and potential gains of this new integrated statistical thinking.


Context-Aware Design of Cyber-Physical Human Systems (CPHS)

arXiv.org Artificial Intelligence

Recently, it has been widely accepted by the research community that interactions between humans and cyber-physical infrastructures have played a significant role in determining the performance of the latter. The existing paradigm for designing cyber-physical systems for optimal performance focuses on developing models based on historical data. The impacts of context factors driving human system interaction are challenging and are difficult to capture and replicate in existing design models. As a result, many existing models do not or only partially address those context factors of a new design owing to the lack of capabilities to capture the context factors. This limitation in many existing models often causes performance gaps between predicted and measured results. We envision a new design environment, a cyber-physical human system (CPHS) where decision-making processes for physical infrastructures under design are intelligently connected to distributed resources over cyberinfrastructure such as experiments on design features and empirical evidence from operations of existing instances. The framework combines existing design models with context-aware design-specific data involving human-infrastructure interactions in new designs, using a machine learning approach to create augmented design models with improved predictive powers.


Nonlinear Time Series Modeling: A Unified Perspective, Algorithm, and Application

arXiv.org Machine Learning

A new comprehensive approach to nonlinear time series analysis and modeling is developed in the present paper. We introduce novel data-specific mid-distribution based Legendre Polynomial (LP) like nonlinear transformations of the original time series {Y (t)} that enables us to adapt all the existing stationary linear Gaussian time series modeling strategy and made it applicable for non-Gaussian and nonlinear processes in a robust fashion. The emphasis of the present paper is on empirical time series modeling via the algorithm LPTime. We demonstrate the effectiveness of our theoretical framework using daily S&P 500 return data between Jan/2/1963 - Dec/31/2009. Our proposed LPTime algorithm systematically discovers all the'stylized facts' of the financial time series automatically all at once, which were previously noted by many researchers one at a time.


CDfdr: A Comparison Density Approach to Local False Discovery Rate Estimation

arXiv.org Machine Learning

Efron et al. (2001) proposed empirical Bayes formulation of the frequentist Benjamini and Hochbergs False Discovery Rate method (Benjamini and Hochberg,1995). This article attempts to unify the `two cultures' using concepts of comparison density and distribution function. We have also shown how almost all of the existing local fdr methods can be viewed as proposing various model specification for comparison density - unifies the vast literature of false discovery methods under one concept and notation.