Power magnetic materials are usually characterized with sinusoidal and triangular waveforms because those are easy for excitation hardware to generate. But in real converters, cores see more complex trapezoidal and PWM-shaped flux trajectories. According to the arXiv preprint, this mismatch is a form of covariate shift that undermines core-loss prediction.
The paper proposes a "cross-material support transfer" approach to address the problem. The method is designed to make loss models more reliable when the operating waveform differs from the test waveform. The abstract does not give details on the algorithm or experimental results, as the text is truncated.
Because the source is a single short abstract, this summary is limited to the problem statement and the proposed solution. No quantitative claims or comparisons are available in the provided material.