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Thomas comments on Open thread, Jul. 11 - Jul. 17, 2016 - Less Wrong
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Does the solution space support this? I can imagine a schedule that only violates 1 criterium, but the nearest correct solution is far away from it. (Seems to me the schedules are similar to 3-SAT in this aspect.)
This is indeed a big and fundamental problem. If 1 criterium only is violated and this persists for many millions of generations, the control program sees this semi-solution as worse and worse. Much worse than a 2 or 4 criteriums miss. So it's then killed.
It's even more complicated than that. Several such tricks are employed and this problem almost vanishes.