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28 March 2024
 
  » arxiv » nlin.AO/0001009

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Some Techniques for the Measurement of Complexity in Tierra
Russell K. Standish ;
Date 10 Dec 1999
Journal Advances in Artificial Life, Lecture Notes in Computer Science, 1674, 104 (Springer: Berlin) (1999)
Subject Adaptation and Self-Organizing Systems; Populations and Evolution | nlin.AO q-bio.PE
AbstractRecently, Adami and coworkers have been able to measure the information content of digital organisms living in their {em Avida} artificial life system. They show that over time, the organisms behave like Maxwell’s demon, accreting information (or complexity) as they evolve. In {em Avida} the organisms don’t interact with each other, merely reproduce at a particular rate (their fitness), and attempt to evaluate an externally given arithmetic function in order win bonus fitness points. Measuring the information content of a digital organism is essentially a process of counting the number of genotypes that give rise to the same phenotype. Whilst Avidan organisms have a particularly simple phenotype, Tierran organisms interact with each other, giving rise to an ecology of phenotypes. In this paper, I discuss techniques for comparing pairs of Tierran organisms to determine if they are phenotypically equivalent. I then discuss a method for computing an estimate of the number of phenotypically equivalent genotypes that is more accurate than the ``hot site’’ estimate used by Adami’s group. Finally, I report on an experimental analysis of a Tierra run.
Source arXiv, nlin.AO/0001009
Other source [GID 7940] nlin.AO/0001009
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