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[–] 20479619? ago 

You need a definition (your desired definition) of "similarity"

You mean image patterns ? (also considering colors or not) ?

You mean exact sequence of bytes ?

There are two major technologies

  • neural net, you train the net to "recognize" patterns, this is fuzzy matching
  • byte comparison, this is exact matching, quite slow, clearly.

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[–] 20482001? [S] ago 

See I'm not even sure where to begin. I'm not even sure how they can be doing it, I know there are bot nets that governments and corporations use to push their agendas. My gut feeling is that in images they share or profile pictures or whatever there are embedded ways they can recognize each other and let their fellow bots know what to do. For example upvote this, downvote this, share this, respond with this canned response, etc.

If this is true it would be outstanding if a person could crack it and turn it to their own purpose.

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[–] 20486284? ago 

I see, it is neural-net

Google has their own version of the same old tech (neural-net was so old style name)

https://www.tensorflow.org/

Have a look at the tutorial and the examples on "classification"