Giorgio Gilestro
62c68d6c8c
Enter the Lamarckian society with a robust theoretical frame. The single-
locus, fixed-p* model can only express recovery toward a ceiling; the
society's load-bearing claim is vertical -- capability that EXCEEDS any
component. Generalize knowledge to a distribution over genotypes (L
biallelic loci, K=2^L, additive fitness = # correct loci), reusing all the
K-mode machinery. The one new operator is recombination: free recombination
sends p -> product of per-locus marginals (linkage equilibrium).
E8 (star, kind: society) -- the vertical claim / Fisher-Muller: decorrelated
PARENTS (specialists, expert on their loci, agnostic elsewhere) are
recombined; sexual merge assembles a genotype fitter than any parent,
climbing to the optimum (12/12, a genotype no parent had) as parent count
grows and rho->0, while the best single parent (~8.7) and the mean-mixture
"model soup" (~11.6) plateau below. Reuses make_retention_matrix (locus
mastery replaces tail-item retention).
E7 (kind: genotype_lineage) -- the advantage of sex: a single population
adapts toward the optimum; the sexual lineage adapts faster than asexual
(clonal interference) by keeping loci in linkage equilibrium (LD->0 vs LD
spike). Honest scope: a speed advantage, not a permanent Muller's-ratchet
gap (subtle to force); E8 carries the headline.
Metaphor shift (per GG): the society is sexual reproduction with UNBOUNDED
parents, not teacher->pupil. Teacher->pupil caps at the ceiling; n-parent
recombination is combinatorial and generative, and unlike biology there is
no two-parent limit. Collapse = asexual degradation; the cure = sex. This
unifies E4 (merge != average) + E6 (irreversibility) under evolution-of-sex
theory and reaches ground Riis's single-locus n-grams cannot.
New: knowledge/{genotype,genotype_lineage,society}.py, configs/layer1/{E7,
E8}.yaml, figures/plot_{E7,E8}.py, READMEs, tests/test_genotype.py (+7).
experiment.py dispatch (kind in {genotype_lineage, society}); make layer1
wired. 112 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
29 lines
1.3 KiB
YAML
29 lines
1.3 KiB
YAML
experiment: E7
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kind: genotype_lineage
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seed: 20260705
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n_replicates: 20
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# (The advantage of sex — the dynamic mechanism behind E8): a single population adapts from all-wrong
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# toward a multi-locus optimum under selection + drift + mutation. Beneficial alleles arise in
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# different sub-lineages; recombination reassorts them into one genotype, while an asexual lineage
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# suffers clonal interference (the alleles compete and cannot combine). Expect the SEXUAL lineage
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# (recomb_rate=1) to climb toward the optimum faster than the ASEXUAL one (recomb_rate=0) — the
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# classical advantage of sex, and the reason a lone model lineage cannot do what a recombining
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# society can. Honest scope: a SPEED advantage, not a dramatic permanent gap (the single-population
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# ratchet is subtle); E8 carries the headline. Falsifier: sexual adapts no faster than asexual.
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genotype:
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L: 12
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n: 150 # population/resample size (drift strength)
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mu: 0.02 # per-locus mutation (flip) rate
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base: 1.3 # multiplicative selection: fitness weight = base^(#correct loci)
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recomb_rate: 0.0 # overwritten per arm by the sweep
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init: wrong # start all-wrong (load L); adapt upward
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generations: 120
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sweep:
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- param: genotype.recomb_rate
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values: [0.0, 1.0] # asexual vs sexual
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output: {dir: results/E7}
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