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Does someone know if machine learning has been used to build keyboard layout?

It would be amazing to say I use {English} as my main language and I code in {Elm} 80% of my time and {c++}. I use {this} keyboard layout and tadaaa, this is the best multi layered layout based on these settings with your hardware keyboard.

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If nonlinear mathematical optimization counts as machine learning, there's been at least one paper (see my other post[1] and optimization group's page[2]).

Carpalx[3] is more like what you envision, but it uses simulated annealing instead of mathematical programming[4], so you won't know how far from the true optimum its solutions are.

[1] https://news.ycombinator.com/item?id=27428539

[2] http://resources.mpi-inf.mpg.de/keyboardoptimization/

[3] http://mkweb.bcgsc.ca/carpalx/

[4] http://mkweb.bcgsc.ca/carpalx/?simulated_annealing

There are many layouts that are computer optimized. The layout RSTHD that the base layer of T-34 is based on used simulated annealing for example:

https://xsznix.wordpress.com/2016/05/16/introducing-the-rsth...

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