Fig. 4: Aggregated frequency activation profiles for Healthy and OA classes obtained using the FullGrad on the ResNet18 model. | npj Biomedical Innovations

Fig. 4: Aggregated frequency activation profiles for Healthy and OA classes obtained using the FullGrad on the ResNet18 model.

From: A robust and interpretable deep transfer learning framework on knee acoustic emissions for osteoarthritis classification

Fig. 4

The solid lines represent the mean activation values across multiple runs, while the shaded areas indicate one standard deviation around the means. Notably, the difference in activation between Healthy and OA classes is more pronounced at lower frequencies, indicating stronger class-specific distinctions in this range.

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