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Saman K. Halgamuge

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#machine learning Preprint Oct 2026

SmoothOperator: Enhancing Representations for Fine-grained Open-set Recognition via Modulated Label Smoothing

A plug-in, SmoothOperator (SmoothOP), which sets the smoothing coefficient of each sample from its prominence, an embedding-space signal measuring how clearly the sample's own class stands out against its strongest competing class, integrates into four existing spherical representation learning methods at minimal train...

Thiru Thillai Nadarasar Bahavan, Yu Xia, Sachith Seneviratne et al. · 0 citations
#machine learning Review Sep 2026

CORDIAL: Calibrating Ordinal LLM Outputs from Few Labels

A large language model (LLM) can turn a text into a distribution over an ordered scale, but that distribution is a noisy measurement: saturated, compressed or exaggerated, and biased in a consistent direction. We propose CORDIAL, which treats the model's output as a noisy reading of the true label and corrects it with...

Xiang-Wei Wang, Peng Wang, Saman K. Halgamuge · 0 citations
#artificial intelligence Preprint Sep 2026

When Agents Disagree: Bayesian Backward Reasoning as a Label-Free Anchor for Multi-Agent Collective Decision-Making

When multiple LLM agents yield conflicting answers, the decision-making process dictates whether agent diversity improves performance or merely compounds shared errors. Existing collective decision-making methods, including voting, electoral rules, and LLM judges, rely on forward reasoning: they map evidence to labels...

Ken Chen, Wei Wang, Sachith Seneviratne et al. · 0 citations
#machine learning Preprint Sep 2026

Bidirectional Multimodal Fusion of Sky Images and Time-Series for Solar Forecasting with Large Language Models

Short-term photovoltaic (PV) power and global horizontal irradiance (GHI) forecasts are essential for effective dispatch, reserve scheduling, and grid operations. At these forecasting horizons, errors are predominantly driven by cloud induced ramps: relying solely on historical numerical data may struggle to anticipate...

Ken Chen, M. Perera, Wei Wang et al. · 0 citations
Jun 2026

FedLAS: Feature-Modulated Bidirectional Label Smoothing for Neural Network Calibration

This work proposes FedLAS: Feature-Modulated Bidirectional Label Smoothing, a plug-and-play algorithm for label smoothing-based losses that consistently improves calibration compared to modern baselines, reducing Expected Calibration Error (ECE) and Adaptive ECE while maintaining Top-1 accuracy.

Thiru Thillai Nadarasar Bahavan, Sachith Seneviratne, Saman K. Halgamuge · 0 citations

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