Search Results for author: Sofia Ira Ktena

Found 11 papers, 4 papers with code

Deep Bayesian Bandits: Exploring in Online Personalized Recommendations

no code implementations3 Aug 2020 Dalin Guo, Sofia Ira Ktena, Ferenc Huszar, Pranay Kumar Myana, Wenzhe Shi, Alykhan Tejani

Recommender systems trained in a continuous learning fashion are plagued by the feedback loop problem, also known as algorithmic bias.

Recommendation Systems

Addressing Delayed Feedback for Continuous Training with Neural Networks in CTR prediction

no code implementations15 Jul 2019 Sofia Ira Ktena, Alykhan Tejani, Lucas Theis, Pranay Kumar Myana, Deepak Dilipkumar, Ferenc Huszar, Steven Yoo, Wenzhe Shi

The focus of this paper is to identify the best combination of loss functions and models that enable large-scale learning from a continuous stream of data in the presence of delayed labels.

Click-Through Rate Prediction

Graph Saliency Maps through Spectral Convolutional Networks: Application to Sex Classification with Brain Connectivity

no code implementations5 Jun 2018 Salim Arslan, Sofia Ira Ktena, Ben Glocker, Daniel Rueckert

Graph convolutional networks (GCNs) allow to apply traditional convolution operations in non-Euclidean domains, where data are commonly modelled as irregular graphs.

General Classification

DLTK: State of the Art Reference Implementations for Deep Learning on Medical Images

1 code implementation18 Nov 2017 Nick Pawlowski, Sofia Ira Ktena, Matthew C. H. Lee, Bernhard Kainz, Daniel Rueckert, Ben Glocker, Martin Rajchl

We present DLTK, a toolkit providing baseline implementations for efficient experimentation with deep learning methods on biomedical images.

Image Segmentation Semantic Segmentation

Exploring Heritability of Functional Brain Networks with Inexact Graph Matching

no code implementations29 Mar 2017 Sofia Ira Ktena, Salim Arslan, Sarah Parisot, Daniel Rueckert

Data-driven brain parcellations aim to provide a more accurate representation of an individual's functional connectivity, since they are able to capture individual variability that arises due to development or disease.

Graph Matching

Spectral Graph Convolutions for Population-based Disease Prediction

1 code implementation8 Mar 2017 Sarah Parisot, Sofia Ira Ktena, Enzo Ferrante, Matthew Lee, Ricardo Guerrerro Moreno, Ben Glocker, Daniel Rueckert

We demonstrate the potential of the method on the challenging ADNI and ABIDE databases, as a proof of concept of the benefit from integrating contextual information in classification tasks.

Disease Prediction

Distance Metric Learning using Graph Convolutional Networks: Application to Functional Brain Networks

3 code implementations7 Mar 2017 Sofia Ira Ktena, Sarah Parisot, Enzo Ferrante, Martin Rajchl, Matthew Lee, Ben Glocker, Daniel Rueckert

Evaluating similarity between graphs is of major importance in several computer vision and pattern recognition problems, where graph representations are often used to model objects or interactions between elements.

Graph Similarity Metric Learning

Comparison of Brain Networks with Unknown Correspondences

no code implementations15 Nov 2016 Sofia Ira Ktena, Sarah Parisot, Jonathan Passerat-Palmbach, Daniel Rueckert

In this work we explore a method based on graph edit distance for evaluating graph similarity, when correspondences between network elements are unknown due to different underlying subdivisions of the brain.

Graph Similarity

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