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Pietro Astolfi

7 accepted papers

2025

$\mathbb{X}$-Sample Contrastive Loss: Improving Contrastive Learning with Sample Similarity Graphs

ICLR 2025poster

Learning good representations involves capturing the diverse ways in which data samples relate. Contrastive loss—an objective matching related samples—underlies methods from self-supervised to multimodal learning. Contrastive losses, however, can be viewed more broadly as modifying a similarity grap…

Cited by 0SourcePDFScholar
2025

Boosting Latent Diffusion with Perceptual Objectives

ICLR 2025poster

Latent diffusion models (LDMs) power state-of-the-art high-resolution generative image models. LDMs learn the data distribution in the latent space of an autoencoder (AE) and produce images by mapping the generated latents into RGB image space using the AE decoder. While this approach allows for eff…

Cited by 0SourcePDFScholar
2025

Improving the Scaling Laws of Synthetic Data with Deliberate Practice

ICML 2025oral

Inspired by the principle of deliberate practice in human learning, we propose Deliberate Practice for Synthetic Data Generation (DP), a novel framework that improves sample efficiency through dynamic synthetic data generation. Prior work has shown that scaling synthetic data is inherently challengi…

Cited by 0SourcePDFScholar
2025

Object-centric binding in Contrastive Language-Image Pretraining

NeurIPS 2025poster

Recent advances in vision language models (VLM) have been driven by contrastive models such as CLIP, which learn to associate visual information with their corresponding text descriptions. However, these models have limitations in understanding complex compositional scenes involving multiple objects…

Cited by 0SourceScholar
2024

A Picture is Worth More Than 77 Text Tokens: Evaluating CLIP-Style Models on Dense Captions

CVPR 2024poster

Curation methods for massive vision-language datasets trade off between dataset size and quality. However even the highest quality of available curated captions are far too short to capture the rich visual detail in an image. To show the value of dense and highly-aligned image-text pairs we collect…

2024

On improved Conditioning Mechanisms and Pre-training Strategies for Diffusion Models

NeurIPS 2024poster

Large-scale training of latent diffusion models (LDMs) has enabled unprecedented quality in image generation. However, large-scale end-to-end training of these models is computationally costly, and hence most research focuses either on finetuning pretrained models or experiments at smaller scales…

Cited by 1SourcePDFScholar
2023

Semi-Supervised Learning Made Simple With Self-Supervised Clustering

CVPR 2023poster

Self-supervised learning models have been shown to learn rich visual representations without requiring human annotations. However, in many real-world scenarios, labels are partially available, motivating a recent line of work on semi-supervised methods inspired by self-supervised principles. In this…