Workshop: 2nd ICML Workshop on Machine Learning for Astrophysics

Domain Adaptation via Minimax Entropy for Real/Bogus Classification of Astronomical Alerts

Guillermo Cabrera-Vives · César Bolívar · Francisco Förster · Alejandra Muñoz-Arancibia · Manuel Pérez-Carrasco · esteban reyes · Larry Denneau


Time domain astronomy is advancing towards the analysis of multiple massive datasets in real time, prompting the development of multi-stream machine learning models. In this work, we studyDomain Adaptation (DA) for real/bogus classification of astronomical alerts using four different datasets: HiTS, DES, ATLAS, and ZTF. We study the domain shift between these datasets, and improve a naive deep learning classification model by using a fine tuning approach and semi-supervised deep DA via Minimax Entropy (MME). We compare the balanced accuracy of these models for different source-target scenarios. We find that both the fine tuning and MME models improve significantly the base model with as few as 1 labeled item per class coming from the target dataset, but that the MME does not compromise its performance on the source dataset.

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