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I'm in no way a researcher or even an enthusiast of machine learning, but I'm pretty sure that I came across a paper posted on HN a few days ago that did exactly what you and the parent poster are describing, figuring out what pixels contributed most to some machine learning algorithm. I'll try and see if I can find it.

Edit: yep, found it.

SmoothGrad: removing noise by adding noise, https://arxiv.org/abs/1706.03825

Web page with explanations and examples

https://tensorflow.github.io/saliency/

I couldn't find the HN thread, but there was no discussion as far as I remember.



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