Aleix Nieto Juscafresa

PhD Student in Machine Learning.

Aleix Nieto Juscafresa

I am a PhD student in Machine Learning at the Division of Systems and Control, Department of Information Technology, Uppsala University, supervised by Jens Sjölund. I am also a WASP PhD student in the WASP Graduate School (ML/X track, 2026 cohort). My research focuses on machine learning for breast cancer.

I hold a BSc in Mathematics from the University of Barcelona, with a minor in Statistics, and an MSc in Data Science (Machine Learning and Statistics) from Uppsala University. For my master’s thesis I developed graph neural network-based preconditioners to accelerate the GMRES algorithm — work I later continued as a research assistant in the same group, leading to a publication at the Northern Lights Deep Learning Conference (NLDL).

Before starting my PhD, I spent a year at KTH Royal Institute of Technology as a research engineer in the Division of Robotics, Perception and Learning, where I worked on a computer vision project: using diffusion-based generative models for plankton image classification within a marine environmental research project.

In my free time I enjoy hiking, travelling, and football.

News

Recent and upcoming activities.

Publications

See also my Google Scholar profile.

2026

Diffusion representations for fine-grained image classification: a marine plankton case study

Aleix Nieto Juscafresa, Álvaro Mazcuñán Herreros, Josephine Sullivan
arXiv:2601.13416
2025

Learning incomplete factorization preconditioners for GMRES

Paul Häusner, Aleix Nieto Juscafresa, Jens Sjölund
Northern Lights Deep Learning Conference (NLDL) · PMLR 265:85–99
2024

Graph neural network-based preconditioners for optimizing GMRES

Aleix Nieto Juscafresa
Master’s thesis · Uppsala University
2022

An introduction to explainable artificial intelligence with LIME and SHAP

Aleix Nieto Juscafresa
Bachelor’s thesis · University of Barcelona

Teaching

During my time as a master’s student I was employed as a Teaching Assistant at the IT department of Uppsala University. As part of my PhD education I am working 20% on teaching duties.

Courses

Advanced Probabilistic Machine Learning

Graduate

Statistical Machine Learning

Graduate

Introduction to Machine Learning

Undergraduate

Scientific Computing for Data Analysis

Undergraduate