Nature is often solving optimization problems
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On long term, evolution of species
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On short term, interpretation of visual and other sensor information
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Physics laws can usually be formulated as variational (optimization) problems
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We can also - and indeed this should be the norm? - combine methods
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e.g. nature uses a bunch of different approachs for optimizing human race:
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Genetic algorithms evolve people over long time period
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Expert systems for high level reasoning
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Learning networks and ? for intermediate level vision
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optimization networks for low level vision
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