United States

Current automated content moderation systems fail to protect children from harmful YouTube content, particularly in under-resourced, code-switched settings. These systems are often text-only, English-centric, and operate as &#39;black boxes,&#39; lacking the multimodal understanding and transparency needed for effective moderation. This thesis proposes a novel hybrid framework for the explainable multimodal detection of harmful content in videos with code-switching. The proposed framework integrates a fine-tuned classifier for accurate, scalable detection with an LLM-powered module that synthesizes the classifier’s internal evidential signals (e.g., text attention and visual heat maps) to generate faithful, human-readable rationales for each decision. As a primary case study, the framework will be developed and validated on an English–Filipino code-switched dataset. Expected contributions include a new dataset publicly available under controlled access (de-identified transcripts, blurred frames, extracted feature representations, and metadata via data-sharing agreement) and a blueprint for building more equitable, transparent, and trustworthy AI safety systems.

ACL 2026

Thesis Proposal: An Explainable Multimodal Framework for Detecting Harmful Content in Code-Switched Children’s Media

**Welcome to ACL-IJCNLP 2021!**

The great event is jointly organized by the Association for Computational Linguistics (ACL) and Asian Federation of Natural Language Processing (AFNLP). 

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ACL-IJCNLP 2021

The great event is jointly organized by the Association for Computational Linguistics (ACL) and Asian Federation of Natural Language Processing (AFNLP).

Current automated content moderation systems fail to protect children from harmful YouTube content, particularly in under-resourced, code-switched settings. These systems are often text-only, English-centric, and operate as 'black boxes,' lacking the multimodal understanding and transparency needed for effective moderation. This thesis proposes a novel hybrid framework for the explainable multimodal detection of harmful content in videos with code-switching. The proposed framework integrates a fine-tuned classifier for accurate, scalable detection with an LLM-powered module that synthesizes the classifier’s internal evidential signals (e.g., text attention and visual heat maps) to generate faithful, human-readable rationales for each decision. As a primary case study, the framework will be developed and validated on an English–Filipino code-switched dataset. Expected contributions include a new dataset publicly available under controlled access (de-identified transcripts, blurred frames, extracted feature representations, and metadata via data-sharing agreement) and a blueprint for building more equitable, transparent, and trustworthy AI safety systems.

poster

It is my great pleasure and honor to welcome you to the 64th Annual Meeting of the Association for Computational Linguistics (ACL 2026), held in San Diego, California, USA, July 2–7, 2026. ACL 2026 continues our fields tradition of excellence in scholarship, innovation, and inclusivity, and I am deeply grateful to the many volunteers who have worked tirelessly to bring this event to life.

It is exciting to see the many developments in the field reflected at our conference, such as the advancement of large language models (born out of our community) into many application directions. This is not without challenges, partly due to unsolved problems, and partly due to misuse of the technology. All this is reflected well at ACL 2026. The conference also reflects that the field is not only about advancing technology, but also the science of fundamentally understanding language and how it is use by many different speaker communities. <br>
[Full Message from General Chair Philipp Koehn](https://drive.google.com/file/d/1QiJFOmMjvDgsDo3i1XzlQnImxe3RU_Cy/view?usp=sharing) <br><br><br>
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The 64th Annual Meeting of the Association for Computational Linguistics (ACL 2026) will take place in San Diego, California, from July 2 - 7, 2026.

Agentic retrieval-augmented generation (RAG) frameworks such as Search-R1 (Jin et al., 2025) improve performance on complex, multi-hop questions by interleaving reasoning and retrieval, but they often retrieve previously seen information and struggle to integrate evidence into the current reasoning state. We study lightweight test-time modifications to Search-R1 that target these inefficiencies without changing training: contextualization of retrieved passages, de-duplication of previously seen documents, and a hybrid of both. Evaluated on 500-example subsets of HotpotQA (Yang et al., 2018) and Natural Questions (Kwiatkowski et al., 2019) using exact match (EM), LLM-based semantic matching, and average retrieval turns, our best method - contextualization with GPT-4.1-mini - improves exact match by 5.6% and reduces retrieval turns by 10.5% relative to the Search-R1 baseline. These results suggest that improved use of retrieved evidence, rather than enforcing retrieval diversity alone, is the main driver of better answer accuracy and efficiency.

Test-Time Strategies for More Efficient and Accurate Agentic RAG

Eye-tracking metrics offer valuable insights into human visual attention during language comprehension, yet existing corpora lack diverse machine-generated text samples. To bridge this gap, we introduce Gaze Responses for Evaluating AI Texts (GREAT), a comprehensive dataset and software framework capturing human eye-movement patterns during screen reading of passages generated by large language models (LLMs). The dataset includes raw eye-movement recordings, reading-time measures, and post-reading evaluations for LLM-generated passage pairs from MT-Bench, alongside rigorous validation metrics. The collected eye-tracking metrics demonstrate strong explanatory power in predicting text quality. When integrated with negative log-likelihood (NLL), a commonly used metric for evaluating text quality, substantially enhance model performance across all standard statistical criteria. These findings demonstrate that eye-tracking data effectively complement probabilistic metrics, improving predictive accuracy for text quality assessment. The full dataset and some processing code are publicly available at https://anonymous.4open.science/r/eye-track.

Eye Movement Features Can Predict Human Preferences on Machine-Generated Texts

Multilingual language models now cover more languages than ever, yet script-sharing low-resource languages remain vulnerable to failures driven by script and dominant-language priors. This dissertation studies one such failure mode, $semantic$ $interference$, in Square Bai Script, where many forms resemble Chinese characters but often differ in meaning. We argue that current adaptation pipelines underperform not only because Bai is low-resource, but because they treat visible overlap as safe transfer by default. Building on an expert-validated corpus of 28,382 Bai-Chinese sentence pairs, an out-of-domain epigraphic set and a reproducible encoding pipeline, the dissertation will (1) diagnose semantic interference, (2) compare adaptation strategies under realistic compute constraints, and (3) estimate when shared-script transfer helps or harms adaptation. The long-term goal is Bai-capable understanding and generation. The dissertation addresses the prerequisite problem of safe and effective adaptation in a script-sharing low-resource setting.

Thesis Proposal: Diagnosing and Mitigating Semantic Interference in Script-Sharing Low-Resource Language Models: A Case Study on Square Bai Script

Fringe platforms like Gab harbor high volumes of hate speech due to minimal moderation and insular communities. Our study examines the factors that determine how hate speech amplifies on these platforms. We scraped a novel dataset of 5K+ threads and 50K+ responses from four fringe platforms (Gab, 4chan, Stormfront, and Vanguard), where hate speech amplification was measured using platform-specific engagement metrics. We trained both Generalized Linear Models and Gradient Boosted Tree models to estimate how several features influence the amplification of hate speech on fringe platforms, and used Shapley value estimates to identify the relative importance of the features. Our analysis shows that research insights from social network analysis (SNA) of mainstream sites like X do not directly generalize to fringe platforms. For instance, our experiments show that using features like thread structure and disagreements in early response windows can give up to 74% RMSE lift in predicting reply counts for hateful posts on fringe platforms, on top of a baseline model with features like hate intensity and thread age that would be considered predictive by regular SNA methods.

Analyzing Hate Speech Amplification on Fringe Platforms

As large language models (LLM) trained on massive corpora scraped from the web exhibit the capability to reproduce sensitive and copyright-protected data, the field of machine unlearning has emerged to address the arising ethical and legal concerns. While previous research has provided a unified evaluation of LLM unlearning methods, this unification remains constrained to English-only models and datasets. We aim to address the prevailing fragmentation in recent cross-lingual unlearning research by extending existing unified benchmarks with multilingual data. To that end, we plan to compile a dataset of parallel translations of question-answer pairs consisting of real-world facts and synthetic personally identifiable information. Moreover, we will focus on mitigating model degradation during unlearning by selectively editing only those layers that contain the given knowledge.

Thesis Proposal: Targeted and Unified Cross-Lingual Unlearning from Multilingual Language Models

AI agents that interact with graphical user interfaces (GUIs) require effective observation representations for reliable grounding. The accessibility tree is a commonly used text-based format that encodes UI element attributes, but it suffers from redundancy and lacks structural information such as spatial relationships among elements. We propose A11y-Compressor, a framework that transforms linearized accessibility trees into compact and structured representations. Our implementation, Compressed-a11y, applies a lightweight and structured transformation pipeline with modal detection, redundancy reduction, and semantic structuring. Experiments on the OSWorld benchmark show that Compressed-a11y reduces input tokens to 22\% of the original while improving task success rates by 5.1 percentage points on average.

A11y-Compressor: A framework for Enhancing the Efficiency of GUI Agent Observations through Visual Context Reconstruction and Redundancy Reduction

Large Language Models specialized for the medical domain achieve high performance on static benchmarks, but remain vulnerable to sycophantic confabulation, where the models generate medically spurious rationales to justify incorrect user hints. This robustness gap poses severe risks in clinical environments, as models may prioritize contextual faithfulness to a biased prompt over their internal parametric medical knowledge. This study introduces a mechanistic approach to identify and mitigate these failures in MedGemma-27B, isolating hint integration circuits using Sparse Autoencoders and geometric manifold analysis. Our findings reveal that sycophantic bias is a highly distributed and polymorphic concept, with biased reasoning routed through shifting dimensions across transformer layers. We identify a specific causal bottleneck for bias formation and demonstrate that cluster-conditioned dynamic steering tailored to the geometric subspace of the prompt outperforms static global interventions, though it reveals a fundamental tension between bias resilience and the retention of internal parametric knowledge.This work proposes a principled framework toward clinical AI systems that are more robust and aligned with expert medical logic, demonstrating the potential of cluster-conditioned geometric interventions while characterizing the inherent trade-offs in clinical knowledge retention.

Probing Bias Formation in Medical LLMs through Activation Steering

Sycophancy, the response pattern of language models to flatter and agree with users statements rather than correcting them, is widely studied but benchmarked inconsistently. To enable better interpretations of the contested concept of model sycophancy, we evaluate eight models on eight popular sycophancy benchmarks across five random seeds (32,000 evaluations). Cross-benchmark correlations average near zero, benchmarks fail to agree on which models are most sycophantic, and combining them yields negative internal consistency. Only 2 of 28 model-level benchmark pairs correlate significantly, one of which is negative. Yet, individual benchmarks show high test-retest reliability, confirming they measure their specific operational definition consistently, just not the same construct. We recommend multi-benchmark evaluation designs spanning at least three benchmark families before global interpretations about model sycophancy.

Identifying the Convergent Sycophancy Gap in Model Evaluations

Patient health literacy is a critical determinant of health outcomes, yet medical discharge summaries remain inaccessible to many patients due to jargon and complex language. Large language models (LLMs) offer a promising means of bridging this gap, but their deployment in resource-constrained hospital environments demands lightweight, privacy-preserving solutions. We evaluate a range of open- and closed-source LLMs on the MeDiSumQA dataset, comprising real patient discharge summaries paired with lay questions and clinician-verified answers, and demonstrate that open-source models achieve performance comparable to GPT-5. We then introduce LAMP-MedQA, a lightweight multi-agent framework for patient-oriented medical question answering. LAMP-MedQA decomposes the task into an information extraction stage and a text simplification stage, each governed by an automated metric-driven feedback loop that enables iterative self-correction without human-in-the-loop supervision. Implemented using two small open-source models (Qwen2.5-7B-Instruct and Phi-3.5-mini-instruct), the system achieves significantly improved readability (FKGL) and simplification quality (SARI) compared to zero-shot GPT-5, whilst maintaining competitive semantic similarity and clinical accuracy, suggesting that collaborative lightweight agents represent a viable approach to improving health literacy in clinical settings.

LAMP-MedQA: A Lightweight Multi-Agent System for Patient-Oriented Medical Question Answering

Scientific NLP systems often require outputs that satisfy strict, machine-checkable constraints. In this work, we study structured-generation controllability along three axes: structural control, iterative correction, and decoding dynamics. Diffusion decoding is of particular interest because its iterative refinement may improve global structure and revision behavior, but may also introduce distinct failure modes such as termination instability and repetition. To quantify controllability, we evaluate compliance with five machine-checkable constraints: (i) required headings and (ii) correct ordering, which reflect global structural control; (iii) explicit end markers and (iv) per-section bullet constraints, which probe local constraint adherence; and (v) repetition avoidance, which captures generation stability under different decoding dynamics. We use these metrics to assess both single-pass generation and changes under iterative correction. Our goal is to isolate structural reliability under parser-facing requirements rather than to directly measure scientific correctness. Across our benchmark, diffusion models tend to better preserve global structure, while iterative improvement substantially improves explicit termination and other local control constraints. Hybrid systems show mixed behavior depending on decoding order. These results suggest that machine-checkable controllability can be usefully decomposed into global structure versus local control, and that the two may benefit from different inference-time strategies.

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