How to reshape vector to make feature map and visualize?

vision
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I want to make feature map for image.

So I find the article about extract feature vectors.
(link here: https://becominghuman.ai/extract-a-feature-vector-for-any-image-with-pytorch-9717561d1d4c)

I get some vectors for my image. then how can visualize the feature map?(not just number… I want to visualize with color…)