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Understanding Evolutionary Potential in Virtual CPU Instruction Set Architectures

Understanding Evolutionary Potential in Virtual CPU Instruction Set Architectures | Living |

We investigate fundamental decisions in the design of instruction set architectures for linear genetic programs that are used as both model systems in evolutionary biology and underlying solution representations in evolutionary computation. We subjected digital organisms with each tested architecture to seven different computational environments designed to present a range of evolutionary challenges. Our goal was to engineer a general purpose architecture that would be effective under a broad range of evolutionary conditions. We evaluated six different types of architectural features for the virtual CPUs: (1) genetic flexibility: we allowed digital organisms to more precisely modify the function of genetic instructions, (2) memory: we provided an increased number of registers in the virtual CPUs, (3) decoupled sensors and actuators: we separated input and output operations to enable greater control over data flow. We also tested a variety of methods to regulate expression: (4) explicit labels that allow programs to dynamically refer to specific genome positions, (5) position-relative search instructions, and (6) multiple new flow control instructions, including conditionals and jumps. Each of these features also adds complication to the instruction set and risks slowing evolution due to epistatic interactions. Two features (multiple argument specification and separated I/O) demonstrated substantial improvements in the majority of test environments, along with versions of each of the remaining architecture modifications that show significant improvements in multiple environments. However, some tested modifications were detrimental, though most exhibit no systematic effects on evolutionary potential, highlighting the robustness of digital evolution. Combined, these observations enhance our understanding of how instruction architecture impacts evolutionary potential, enabling the creation of architectures that support more rapid evolution of complex solutions to a broad range of challenges.


Via Ashish Umre
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6 Great Videos on Teaching Critical Thinking

6 Great Videos on Teaching Critical Thinking | Living |

Via Dr. Richard NeSmith, Sakis Koukouvis
Dr. Richard NeSmith's curator insight, December 13, 2012 7:38 PM

Critical thinking is a skill that we can teach to our students through exercise and practice. It is particularly a skill that contains a plethora of other skills inside it. Critical thinking in its basic definition refers"  to a diverse range of intellectual skills and activities concerned with evaluating information as well as evaluating our thought in a disciplined way ".

cherimacleod's curator insight, December 15, 2012 11:44 AM

Brief but pithy examples we can all relate to.

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How I Changed Careers When I Was Nearly 40 - Forbes

How I Changed Careers When I Was Nearly 40 - Forbes | Living |
As a single woman in her late 30's, things were good. I could have kept speeding up the corporate ladder, but I wanted to try something new.
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