Aggregating a dataset, then injecting some noise, is a simple and common way to release differentially private data.However, aggregated data -- even without noise -- is not an appropriate input for machine learning classifiers.In this work, we show how a new model, similar to a logistic regression, may be learned from aggregated data only by approximating the unobserved feature distribution with a maximum entropy hypothesis. The resulting model is a Markov Random Field (MRF), and we detail how to apply, modify and scale a MRF training algorithm to our setting. Finally we present empirical evidence on several public datasets that the model learned this way can achieve performances comparable to those of a logistic model trained with the full unaggregated data.
Beyond Boundary Noise: Aggregated Aleatoric Uncertainty Fails to Capture Presence Ambiguity in 3D Lung Nodule Segmentation
Fraunhofer Heinrich-Hertz-Institut(弗劳恩霍夫海因里希·赫兹研究所);Technische Universität Berlin(柏林工业大学);The Berlin Institute for the Foundations of Learning and Data (BIFOLD)(柏林学习与数据基础研究所(BIFOLD))
Generalized Maximum Entropy for Supervised Classification
BCAM-Basque Center for Applied Mathematics(巴斯克应用数学中心);IKERBASQUE-Basque Foundation for Science(巴斯克科学基金会);Department of Electronic Engineering, Tsinghua University(清华大学电子工程系)