Mitigating Real-World Distribution Shifts in the Fourier Domain
Abstract: While machine learning systems can be highly accurate in their training environments, their performance in real-world deployments can suffer significantly due to distribution shifts. Real-world distribution shifts involve various input distortions due to noise, weather, device and other variations. Many real-world distribution shifts are not represented in standard domain adaptation datasets and prior empirical work has shown that domain adaptation methods developed using these standard datasets may not generalize well to real-world distribution shifts. Furthermore, motivated by observations of the sensitivity of deep neural networks (DNN) to the spectral statistics of data, which can vary in real-world scenarios, we propose Fourier Moment Matching (FMM), a model-agnostic input transformation that matches the Fourier-amplitude statistics of source to target data using unlabeled samples. We demonstrate through extensive empirical evaluations across time-series, image classification and semantic segmentation tasks that FMM is effective both individually and when combined with a variety of existing methods to overcome real-world distribution shifts.
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
Submission Length: Regular submission (no more than 12 pages of main content)
Assigned Action Editor: ~Hanie_Sedghi1
Submission Number: 1127