On the method of feature visualization

[fupiao1998]

Thank you for the open source code. Here I would like to ask what method is used to visualize the feature map in figure 1 of the paper. I look forward to your reply！

[iamhankai]

import matplotlib.pyplot as plt
plt.imshow(image)

[fupiao1998]

Fine, this did not help my question, I think it’s better for me to study the answer by myself