Lamarck式进化在形态多变时失效,因亲代学习难传给后代。
Limits of Lamarckian Evolution Under Pressure of Morphological Novelty

- 用模块化机器人模拟进化,比较达尔文与拉马克式遗传。
- 引入形态多样性压力后,拉马克系统性能大幅下降。
- 形态差异大导致学习传承失效,暴露进化策略的权衡限制。
拉马克式遗传在机器人形态与控制器协同进化中表现优异,其优势在于后代继承父母学习到的控制器。但该机制依赖亲代与后代间的形态相似性。本研究通过模块化机器人系统,在纯任务导向选择与同时奖励形态新颖性的多目标选择之间切换,考察拉马克式进化在高形态变异下的表现。结果表明:仅优化任务性能时,拉马克式进化优于达尔文式;但引入形态多样性选择压力后,拉马克系统性能显著下降,远高于达尔文系统。进一步分析显示,多样性驱动降低了亲代与后代的形态相似性,削弱了控制器传承的有效性。该研究揭示了基于继承的利用与多样性驱动的探索之间的根本权衡,限定了拉马克式进化的适用边界。
原文摘要 · Abstract (English)
Lamarckian inheritance has been shown to be a powerful accelerator in systems where the joint evolution of robot morphologies and controllers is enhanced with individual learning. Its defining advantage lies in the offspring inheriting controllers learned by their parents. The efficacy of this option, however, relies on morphological similarity between parent and offspring. In this study, we examine how Lamarckian inheritance performs when the search process is driven toward high morphological variance, potentially straining the requirement for parent-offspring similarity. Using a system of modular robots that can evolve and learn to solve a locomotion task, we compare Darwinian and Lamarckian evolution to determine how they respond to shifting from pure task-based selection to a multi-objective pressure that also rewards morphological novelty. Our results confirm that Lamarckian evolution outperforms Darwinian evolution when optimizing task-performance alone. However, introducing selection pressure for morphological diversity causes a substantial performance drop, which is much greater in the Lamarckian system. Further analyses show that promoting diversity reduces parent-offspring similarity, which in turn reduces the benefits of inheriting controllers learned by parents. These results reveal the limits of Lamarckian evolution by exposing a fundamental trade-off between inheritance-based exploitation and diversity-driven exploration.
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