A machine has figured out Rubik’s Cube all by itself – MIT Technology Review

…random turns of a Rubik’s Cube cannot easily be rewarded, since it is hard to judge whether the new configuration is any closer to a solution. And a sequence of random turns can go on for a long time without reaching a solution, so the end-state reward can only be offered rarely.
— Read on www.technologyreview.com/s/611281/a-machine-has-figured-out-rubiks-cube-all-by-itself/

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