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Re:Backpropagation algorithm visual explanation by nsthorat on Wednesday June 27, 2018 @09:46AM (#17408043)
Unfortunately there is no attribution, but this tool was created by Daniel Smilkov, who also built TensorFlow Playground and who is a cocreator of TensorFlow.js.

https://twitter.com/dsmilkov

Re:Backpropagation algorithm visual explanation by ehsankia on Wednesday June 27, 2018 @11:21AM (#17408864)
Also, going back one on the URL leads you to the Google ML crash course, which I guess this is part of:

https://google-developers.appspot.com/machine-learning/crash...

Definitely worth checking out.