Search Results for author: Grigorios G. Chrysos

Found 19 papers, 8 papers with code

MI-NeRF: Learning a Single Face NeRF from Multiple Identities

no code implementations29 Mar 2024 Aggelina Chatziagapi, Grigorios G. Chrysos, Dimitris Samaras

In this work, we introduce a method that learns a single dynamic neural radiance field (NeRF) from monocular talking face videos of multiple identities.

Generalization of Scaled Deep ResNets in the Mean-Field Regime

no code implementations14 Mar 2024 Yihang Chen, Fanghui Liu, Yiping Lu, Grigorios G. Chrysos, Volkan Cevher

To derive the generalization bounds under this setting, our analysis necessitates a shift from the conventional time-invariant Gram matrix employed in the lazy training regime to a time-variant, distribution-dependent version.

Generalization Bounds

Multilinear Mixture of Experts: Scalable Expert Specialization through Factorization

1 code implementation19 Feb 2024 James Oldfield, Markos Georgopoulos, Grigorios G. Chrysos, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Jiankang Deng, Ioannis Patras

The Mixture of Experts (MoE) paradigm provides a powerful way to decompose inscrutable dense layers into smaller, modular computations often more amenable to human interpretation, debugging, and editability.

Attribute counterfactual

Leveraging the Context through Multi-Round Interactions for Jailbreaking Attacks

no code implementations14 Feb 2024 Yixin Cheng, Markos Georgopoulos, Volkan Cevher, Grigorios G. Chrysos

We contend that the prior context--the information preceding the attack query--plays a pivotal role in enabling potent Jailbreaking attacks.

Multilinear Operator Networks

no code implementations31 Jan 2024 Yixin Cheng, Grigorios G. Chrysos, Markos Georgopoulos, Volkan Cevher

On the other hand, Polynomial Networks is a class of models that does not require activation functions, but have yet to perform on par with modern architectures.

Efficient local linearity regularization to overcome catastrophic overfitting

1 code implementation21 Jan 2024 Elias Abad Rocamora, Fanghui Liu, Grigorios G. Chrysos, Pablo M. Olmos, Volkan Cevher

Our regularization term can be theoretically linked to curvature of the loss function and is computationally cheaper than previous methods by avoiding Double Backpropagation.

Revisiting adversarial training for the worst-performing class

1 code implementation17 Feb 2023 Thomas Pethick, Grigorios G. Chrysos, Volkan Cevher

Despite progress in adversarial training (AT), there is a substantial gap between the top-performing and worst-performing classes in many datasets.

Self-Supervised Neural Architecture Search for Imbalanced Datasets

1 code implementation17 Sep 2021 Aleksandr Timofeev, Grigorios G. Chrysos, Volkan Cevher

The results demonstrate how the proposed method can be used in imbalanced datasets, while it can be fully run on a single GPU.

Neural Architecture Search Self-Supervised Learning

Tensor Methods in Computer Vision and Deep Learning

no code implementations7 Jul 2021 Yannis Panagakis, Jean Kossaifi, Grigorios G. Chrysos, James Oldfield, Mihalis A. Nicolaou, Anima Anandkumar, Stefanos Zafeiriou

Tensors, or multidimensional arrays, are data structures that can naturally represent visual data of multiple dimensions.

Representation Learning

Unsupervised Controllable Generation with Self-Training

no code implementations17 Jul 2020 Grigorios G. Chrysos, Jean Kossaifi, Zhiding Yu, Anima Anandkumar

Instead, we propose an unsupervised framework to learn a distribution of latent codes that control the generator through self-training.

Disentanglement

P-nets: Deep Polynomial Neural Networks

1 code implementation CVPR 2020 Grigorios G. Chrysos, Stylianos Moschoglou, Giorgos Bouritsas, Yannis Panagakis, Jiankang Deng, Stefanos Zafeiriou

Deep Convolutional Neural Networks (DCNNs) is currently the method of choice both for generative, as well as for discriminative learning in computer vision and machine learning.

Image Generation

$Π-$nets: Deep Polynomial Neural Networks

2 code implementations8 Mar 2020 Grigorios G. Chrysos, Stylianos Moschoglou, Giorgos Bouritsas, Yannis Panagakis, Jiankang Deng, Stefanos Zafeiriou

Deep Convolutional Neural Networks (DCNNs) is currently the method of choice both for generative, as well as for discriminative learning in computer vision and machine learning.

Audio Classification Graph Representation Learning +2

Reconstructing the Noise Manifold for Image Denoising

no code implementations11 Feb 2020 Ioannis Marras, Grigorios G. Chrysos, Ioannis Alexiou, Gregory Slabaugh, Stefanos Zafeiriou

Deep Convolutional Neural Networks (CNNs) have been successfully used in many low-level vision problems like image denoising.

Conditional Image Generation Image Denoising +1

Robust Conditional Generative Adversarial Networks

1 code implementation ICLR 2019 Grigorios G. Chrysos, Jean Kossaifi, Stefanos Zafeiriou

Conditional generative adversarial networks (cGAN) have led to large improvements in the task of conditional image generation, which lies at the heart of computer vision.

Conditional Image Generation

Motion deblurring of faces

no code implementations8 Mar 2018 Grigorios G. Chrysos, Paolo Favaro, Stefanos Zafeiriou

Notwithstanding, a much less standing mode of variation is motion deblurring, which however presents substantial challenges in face analysis.

Deblurring Face Verification

Visual Data Augmentation through Learning

no code implementations20 Jan 2018 Grigorios G. Chrysos, Yannis Panagakis, Stefanos Zafeiriou

In addition, the state-of-the-art data-driven methods demand a vast amount of data, hence a standard engineering trick employed is artificial data augmentation for instance by adding into the data cropped and (affinely) transformed images.

Data Augmentation

Deep Face Deblurring

no code implementations27 Apr 2017 Grigorios G. Chrysos, Stefanos Zafeiriou

Blind deblurring consists a long studied task, however the outcomes of generic methods are not effective in real world blurred images.

Deblurring Face Alignment

A Comprehensive Performance Evaluation of Deformable Face Tracking "In-the-Wild"

1 code implementation18 Mar 2016 Grigorios G. Chrysos, Epameinondas Antonakos, Patrick Snape, Akshay Asthana, Stefanos Zafeiriou

Recently, technologies such as face detection, facial landmark localisation and face recognition and verification have matured enough to provide effective and efficient solutions for imagery captured under arbitrary conditions (referred to as "in-the-wild").

Face Alignment Face Detection +1

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