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William B. Andreopoulos

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#artificial intelligence Preprint Aug 2026

RelCheck: Dual-Evidence Spatial Grounding for VLM Hallucination Correction

Multimodal large language models (MLLMs) fre- quently generate text that is inconsistent with the input image. While object- and attribute-level hallucinations have received considerable attention, relational hallucinations (incorrect de- scriptions of spatial or interactive relationships between objects) remain largel...

Siddhi Patil, N. Saxena, William B. Andreopoulos · 0 citations
#artificial intelligence Preprint Open access Aug 2026

Query Implied Generative Engine Optimization

The landscape of search has changed drastically with how people look for information online. Traditional search engines are being replaced by Generative Search Engines (GSEs), which use Large Language Models (LLMs) to generate natural language responses to user queries. For content creators, visibility is no longer sol...

S. Ramakrishna, William B. Andreopoulos · 0 citations
Conference Jul 2026

Fair Influence Maximization with Reverse Influence Sampling Boosted Multi-Objective Genetic Algorithm

Influence maximization (IM) selects a small set of seed users to maximize expected diffusion in a social network, typically under the Independent Cascade model. Optimizing only global spread can amplify pre-existing structural inequities: some groups (e.g., demographics, communities, or departments) may receive far les...

Akash Janardhan Srinivas, Petros Potikas, William B. Andreopoulos et al. · 0 citations
Preprint Aug 2026

Sparse PPMI Graph Averaging for Random Indexing Embeddings

A specific sparse post-processing pipeline for Random Indexing on kinship analogies in a small fairytales corpus is studied; the results do not establish a generally effective embedding method.

S. Loganathan, Gokul Anand, A. B. Bo et al. · 0 citations
Conference Jul 2026

A Reproducible and Budget-Aware Framework for Evaluating Local Retrieval-Augmented Generation (RAG) Robustness to Perturbations

The idea of context is no longer considered secondary in the construction of language-model systems. With the use of local Retrieval-Augmented Generation, even a tiny modification of the prompt or the context might produce another set of retrievals, citations, and ultimately different answers; however, in practice, tes...

Rahul Reddy Gangapuram, William B. Andreopoulos · 0 citations

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