about
Direct Ascent Synthesis: Hidden Generative Capabilities in Discriminative Models (arxiv.org)
2 points by kynez on Feb 15, 2025 | hide | past | pdf | discuss on HN

In plain words: Instead of nudging one full-size image to match a classifier's inner representation, which usually yields noisy patterns, they optimize it at many sizes from tiny to full. The result is clean, natural-looking images from a model trained only to sort pictures, with no extra training.

Abstract · Direct Ascent Synthesis: Revealing Hidden Generative Capabilities in Discriminative Models

We demonstrate that discriminative models inherently contain powerful generative capabilities, challenging the fundamental distinction between discriminative and generative architectures. Our method, Direct Ascent Synthesis (DAS), reveals these latent capabilities through multi-resolution optimization of CLIP model representations. While traditional inversion attempts produce adversarial patterns, DAS achieves high-quality image synthesis by decomposing optimization across multiple spatial scales (1x1 to 224x224), requiring no additional training. This approach not only enables diverse applications -- from text-to-image generation to style transfer -- but maintains natural image statistics ($1/f^2$ spectrum) and guides the generation away from non-robust adversarial patterns. Our results demonstrate that standard discriminative models encode substantially richer generative knowledge than previously recognized, providing new perspectives on model interpretability and the relationship between adversarial examples and natural image synthesis.

Stanislav Fort, Jonathan Whitaker
arXiv:2502.07753 · cs.CV · submitted Feb 11, 2025
abstract · pdf · html · 12 pages, 12 figures

add comment on HN