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Elita Lobo

6 accepted papers

2025

Alternate Preference Optimization for Unlearning Factual Knowledge in Large Language Models

COLING 2025main

Machine unlearning aims to efficiently eliminate the influence of specific training data, known as the forget set, from the model. However, existing unlearning methods for Large Language Models (LLMs) face a critical challenge: they rely solely on negative feedback to suppress responses related to t…

2024

Axiomatic Aggregations of Abductive Explanations

AAAI 2024technical

The recent criticisms of the robustness of post hoc model approximation explanation methods (like LIME and SHAP) have led to the rise of model-precise abductive explanations. For each data point, abductive explanations provide a minimal subset of features that are sufficient to generate the outcome.…

2024

Fair and Welfare-Efficient Constrained Multi-Matchings under Uncertainty

NeurIPS 2024poster

We study fair allocation of constrained resources, where a market designer optimizes overall welfare while maintaining group fairness. In many large-scale settings, utilities are not known in advance, but are instead observed after realizing the allocation. We therefore estimate agent utilities usin…

2023

Percentile Criterion Optimization in Offline Reinforcement Learning

NeurIPS 2023poster

In reinforcement learning, robust policies for high-stakes decision-making problems with limited data are usually computed by optimizing the percentile criterion. The percentile criterion is optimized by constructing an uncertainty set that contains the true model with high probability and optimizin…

2022

Data poisoning attacks on off-policy policy evaluation methods

UAI 2022poster

Off-policy Evaluation (OPE) methods are a crucial tool for evaluating policies in high-stakes domains such as healthcare, where exploration is often infeasible, unethical, or expensive. However, the extent to which such methods can be trusted under adversarial threats to data quality is largely unex…

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