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Reference
Lehman, J., Stanley, K.: Beyond open-endedness: quantifying impressiveness. In: Adami, C., et al. (eds.) Proceedings of the Thirteenth International Conference on Artificial Life (ALIFE XIII). MIT Press (2012)
DOI
Abstract
This paper seeks to illuminate and quantify a feature of natu- ral evolution that correlates to our sense of its intuitive great- ness: Natural evolution evolves impressive artifacts. Within artificial life, abstractions aiming to capture what makes nat- ural evolution so powerful often focus on the idea of open- endedness, which relates to boundless diversity, complex- ity, or adaptation. However, creative systems that have passed tests of open-endedness raise the possibility that open- endedness does not always correlate to impressiveness in ar- tificial life simulations. In other words, while natural evo- lution is both open-ended and demonstrates a drive towards evolving impressive artifacts, it may be a mistake to assume the two properties are always linked. Thus to begin to in- vestigate impressiveness independently in artificial systems, a novel definition is proposed: Impressive artifacts readily exhibit significant design effort. That is, the difficulty of cre- ating them is easy to recognize. Two heuristics, rarity and re-creation effort, are derived from this definition and applied to the products of an open-ended image evolution system. An important result is that that the heuristics intuitively separate different reward schemes and provide evidence for why each evolved picture is or is not impressive. The conclusion is that impressiveness may help to distinguish open-ended systems and their products, and potentially untangles an aspect of nat- ural evolution’s mystique that is masked by its co-occurrence with open-endedness.
Extended Abstract
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Full Text
http://eplex.cs.ucf.edu/papers/lehman_alife12b.pdf
