Sign in

Xuefeng Xu

@xuefengxu.bsky.social
0 followers 9 following 8 posts

🔐 Privacy × ML | 🎓 CS PhD @uni-of-warwick.bsky.social | Probably a 🐱 Homepage: xuefeng-xu.github.io

PostsRepliesMedia
Xuefeng Xu @xuefengxu.bsky.social · 29/09/2026
🎉 Paper accepted @vldb.bsky.social 2027 📄 Federated Computation of ROC and PR Curves 📌 TL;DR: Privacy-preserving ROC/PR curve approximation for federated learning 🔗 Project page: xuefeng-xu.github.io/research/fed... 🤝 Joint work with @grahamrc.bsky.social #VLDB2027 #Privacy #FederatedLearning
xuefeng-xu.github.io
Federated Computation of ROC and PR Curves – Xuefeng Xu
Privacy-preserving ROC/PR curve approximation for federated learning.
021
Xuefeng Xu @xuefengxu.bsky.social · 14/09/2026
🎉 Paper accepted @tmlrorg.bsky.social 2026 📄 FedPS: Federated Preprocessing for structured data via aggregated Statistics 📌 TL;DR: A framework for preprocessing tabular data in federated learning 🔗 Project page: xuefeng-xu.github.io/research/fed... 🤝 Joint work with @grahamrc.bsky.social #TMLR
xuefeng-xu.github.io
FedPS: Federated Preprocessing for structured data via aggregated Statistics – Xuefeng Xu
A framework for preprocessing tabular data in federated learning.
111
Xuefeng Xu @xuefengxu.bsky.social · 24/02/2026
📐 Euclidean distance, inner product, and cosine similarity 🤯 They are more connected than you think 🔄 Order preserving transformations link any pair of them 👇 Dive into the math, code, and subtle side effects xuefeng-xu.github.io/blog/distanc... #Transform #Metrics #Python
xuefeng-xu.github.io
Transforming Between Distance Metrics – Xuefeng Xu
Order-preserving transforms between Euclidean Distance, Inner Product, and Cosine Similarity.
000
Reposted by Xuefeng Xu
Differential Privacy Papers @dppapers.bsky.social · 07/10/2025
Federated Computation of ROC and PR Curves Xuefeng Xu, Graham Cormode arxiv.org/abs/2510.04979
Federated Computation of ROC and PR Curves

Xuefeng Xu, Graham Cormode

http://arxiv.org/abs/2510.04979

Receiver Operating Characteristic (ROC) and Precision-Recall (PR) curves are
fundamental tools for evaluating machine learning classifiers, offering
detailed insights into the trade-offs between true positive rate vs. false
positive rate (ROC) or precision vs. recall (PR). However, in Federated
Learning (FL) scenarios, where data is distributed across multiple clients,
computing these curves is challenging due to privacy and communication
constraints. Specifically, the server cannot access raw prediction scores and
class labels, which are used to compute the ROC and PR curves in a centralized
setting. In this paper, we propose a novel method for approximating ROC and PR
curves in a federated setting by estimating quantiles of the prediction score
distribution under distributed differential privacy. We provide theoretical
bounds on the Area Error (AE) between the true and estimated curves,
demonstrating the trade-offs between approximation accuracy, privacy, and
communication cost. Empirical results on real-world datasets demonstrate that
our method achieves high approximation accuracy with minimal communication and
strong privacy guarantees, making it practical for privacy-preserving model
evaluation in federated systems.
001
Xuefeng Xu @xuefengxu.bsky.social · 12/02/2026
🎉 Paper accepted at AISTATS 2026 📄 Power Transform Revisited: Numerically Stable, and Federated 📌 TL;DR: Numerically stable power transforms with an extension to federated learning 🔗 Project page: xuefeng-xu.github.io/research/pow... 🤝 Joint work with Graham Cormode #AISTATS2026
xuefeng-xu.github.io
Power Transform Revisited: Numerically Stable, and Federated – Xuefeng Xu
Numerically stable power transforms with an extension to federated learning.
020
Xuefeng Xu @xuefengxu.bsky.social · 06/01/2026
🔄 Power transforms help reshape data toward a Gaussian distribution 💥 Overflow errors are common when implemented naively 🛠️ This post dives into the cause and shows practical solutions xuefeng-xu.github.io/blog/power-t... #Numerical #Statistics #Python
xuefeng-xu.github.io
Power Transform – Xuefeng Xu
Parametric methods that normalize data but require careful handling to avoid numerical instability.
000
Xuefeng Xu @xuefengxu.bsky.social · 02/12/2025
📊 Interpolation is a foundation for many applications 📈 What if the data points are monotone and we want to preserve that property 👇 This blog explains the details of monotone cubic interpolation xuefeng-xu.github.io/blog/pchip.h... #Statistics #Math
xuefeng-xu.github.io
Monotone Piecewise Cubic Interpolation – Xuefeng Xu
Shape-preserving interpolation method that preserves monotonicity and avoids overshoots.
000
Xuefeng Xu @xuefengxu.bsky.social · 02/11/2025
📈 ROC and PR curves are standard tools for evaluating ML models 🤔 How are they computed and what are their key properties 👇 This blog dives into the details and explores advanced topics xuefeng-xu.github.io/blog/roc-pr-... #MachineLearning #DataScience #Python
xuefeng-xu.github.io
ROC and PR Curves – Xuefeng Xu
Graphical tools for evaluating classification models, highlighting trade-offs in model performance.
020
Xuefeng Xu @xuefengxu.bsky.social · 05/10/2025
Everyone knows how to compute variance... right? 🤔 But the textbook formula can be wildly wrong on computers ⚠️ Here is why and how to fix it in practice 👇 xuefeng-xu.github.io/blog/varianc... #Numerical #Python
xuefeng-xu.github.io
How to Compute Variance? – Xuefeng Xu
Mathematically equivalent formulas for variance can have very different numerical stability.
010