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Guillermo Ortiz-Jimenez

9 accepted papers

2025

LiNeS: Post-training Layer Scaling Prevents Forgetting and Enhances Model Merging

ICLR 2025poster

Fine-tuning pre-trained models has become the standard approach to endow them with specialized knowledge, but it poses fundamental challenges. In particular, (i) fine-tuning often leads to catastrophic forgetting, where improvements on a target domain degrade generalization on other tasks, and (ii)…

2025

On the Difficulty of Constructing a Robust and Publicly-Detectable Watermark

AISTATS 2025poster

This work investigates the theoretical boundaries of creating publicly-detectable schemes to enable the provenance of watermarked imagery. Metadata-based approaches like C2PA provide unforgeability and public-detectability. ML techniques offer robust retrieval and watermarking. However, no existing…

Cited by 0SourceScholar
2024

Localizing Task Information for Improved Model Merging and Compression

ICML 2024poster

Model merging and task arithmetic have emerged as promising scalable approaches to merge multiple single-task checkpoints to one multi-task model, but their applicability is reduced by significant performance loss. Previous works have linked these drops to interference in the weight space and erasur…

2024

Pi-DUAL: Using privileged information to distinguish clean from noisy labels

ICML 2024poster

Label noise is a pervasive problem in deep learning that often compromises the generalization performance of trained models. Recently, leveraging privileged information (PI) -- information available only during training but not at test time -- has emerged as an effective approach to mitigate this is…

Cited by 8SourcePDFScholar
2023

Task Arithmetic in the Tangent Space: Improved Editing of Pre-Trained Models

NeurIPS 2023oral

Task arithmetic has recently emerged as a cost-effective and scalable approach to edit pre-trained models directly in weight space: By adding the fine-tuned weights of different tasks, the model's performance can be improved on these tasks, while negating them leads to task forgetting. Yet, our unde…

2023

When does Privileged information Explain Away Label Noise?

ICML 2023poster

Leveraging privileged information (PI), or features available during training but not at test time, has recently been shown to be an effective method for addressing label noise. However, the reasons for its effectiveness are not well understood. In this study, we investigate the role played by diffe…

2021

What can linearized neural networks actually say about generalization?

NeurIPS 2021poster

For certain infinitely-wide neural networks, the neural tangent kernel (NTK) theory fully characterizes generalization, but for the networks used in practice, the empirical NTK only provides a rough first-order approximation. Still, a growing body of work keeps leveraging this approximation to succe…

2020

Hold me tight! Influence of discriminative features on deep network boundaries

NeurIPS 2020poster

Important insights towards the explainability of neural networks reside in the characteristics of their decision boundaries. In this work, we borrow tools from the field of adversarial robustness, and propose a new perspective that relates dataset features to the distance of samples to the decision…

2020

Neural Anisotropy Directions

NeurIPS 2020poster

In this work, we analyze the role of the network architecture in shaping the inductive bias of deep classifiers. To that end, we start by focusing on a very simple problem, i.e., classifying a class of linearly separable distributions, and show that, depending on the direction of the discriminative…