Search Results for author: Bram Wallace

Found 8 papers, 5 papers with code

Diffusion Model Alignment Using Direct Preference Optimization

no code implementations21 Nov 2023 Bram Wallace, Meihua Dang, Rafael Rafailov, Linqi Zhou, Aaron Lou, Senthil Purushwalkam, Stefano Ermon, Caiming Xiong, Shafiq Joty, Nikhil Naik

Large language models (LLMs) are fine-tuned using human comparison data with Reinforcement Learning from Human Feedback (RLHF) methods to make them better aligned with users' preferences.

End-to-End Diffusion Latent Optimization Improves Classifier Guidance

1 code implementation ICCV 2023 Bram Wallace, Akash Gokul, Stefano Ermon, Nikhil Naik

Classifier guidance -- using the gradients of an image classifier to steer the generations of a diffusion model -- has the potential to dramatically expand the creative control over image generation and editing.

Denoising Image Generation

EDICT: Exact Diffusion Inversion via Coupled Transformations

2 code implementations CVPR 2023 Bram Wallace, Akash Gokul, Nikhil Naik

EDICT enables mathematically exact inversion of real and model-generated images by maintaining two coupled noise vectors which are used to invert each other in an alternating fashion.

Denoising Image Reconstruction +3

Learning Rich Nearest Neighbor Representations from Self-supervised Ensembles

no code implementations19 Oct 2021 Bram Wallace, Devansh Arpit, Huan Wang, Caiming Xiong

Pretraining convolutional neural networks via self-supervision, and applying them in transfer learning, is an incredibly fast-growing field that is rapidly and iteratively improving performance across practically all image domains.

Transfer Learning

Can We Characterize Tasks Without Labels or Features?

1 code implementation CVPR 2021 Bram Wallace, Ziyang Wu, Bharath Hariharan

The problem of expert model selection deals with choosing the appropriate pretrained network ("expert") to transfer to a target task.

Model Selection

Extending and Analyzing Self-Supervised Learning Across Domains

1 code implementation ECCV 2020 Bram Wallace, Bharath Hariharan

There has been little to no work with these methods on other smaller domains, such as satellite, textural, or biological imagery.

Representation Learning Self-Supervised Learning

Few-Shot Generalization for Single-Image 3D Reconstruction via Priors

no code implementations ICCV 2019 Bram Wallace, Bharath Hariharan

To address this problem, we present a new model architecture that reframes single-view 3D reconstruction as learnt, category agnostic refinement of a provided, category-specific prior.

3D Reconstruction Single-View 3D Reconstruction

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