Code and data associated with "The evolution of sex for artificial intelligence - A population-genetic framework for multigenerational model populations". Gilestro, 2026
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Giorgio Gilestro 073fc33509 Accessibility pass: introduce every pop-gen term at first use, with real-world anchors
The CS reader is now walked into the biology as it arrives: drift (surname
extinction, island alleles), Wright-Fisher and heterozygosity defined in
place (collision-probability reading), Muller's ratchet (Y-chromosome decay),
immigration (the one-migrant-per-generation rule of conservation management),
blending inheritance (Jenkin's 1867 swamping argument, which the Proposition
makes exact), Fisher-Muller (clonal competition vs assembly), genotype/locus,
epistasis and NK landscapes glossed, outbreeding depression (the Tatra ibex
restocking collapse), panmixia, BDM incompatibilities (mule sterility),
hybrid load. Three new literature anchors (Mills & Allendorf 1996; Jenkin
1867; Templeton 1986), all verified; references renumbered to
first-appearance order (now 72) and re-verified 1..72.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BkRLcc18rwT2Lysu6PbG7v
2026-09-07 10:58:46 +01:00
configs second review round: tempered claims, robust statistics, corrected technical statements 2026-09-06 17:55:46 +01:00
figures third review round: mathematical corrections + operator separation + headline calibration 2026-09-06 19:29:09 +01:00
hpc hard benchmark: the 7B "fusion wins / no headroom" results were saturation artefacts 2026-07-05 19:13:26 +01:00
paper Accessibility pass: introduce every pop-gen term at first use, with real-world anchors 2026-09-07 10:58:46 +01:00
results third review round: mathematical corrections + operator separation + headline calibration 2026-09-06 19:29:09 +01:00
src second review round: tempered claims, robust statistics, corrected technical statements 2026-09-06 17:55:46 +01:00
tasks lessons: note promotion of the reader-facing-prose rule to global CLAUDE.md 2026-09-07 10:14:03 +01:00
tests epistasis_predicts: functional conflict, not weight geometry, predicts merge failure pre-merge 2026-09-06 17:19:46 +01:00
.gitignore neural: real-MNIST external-validity tier (collapse + grounding) 2026-07-05 09:19:36 +01:00
CLAUDE.md hard benchmark: the 7B "fusion wins / no headroom" results were saturation artefacts 2026-07-05 19:13:26 +01:00
Makefile Phase 3: LLM-tier speciation + multi-seed firm-up of the recombination claims 2026-09-06 15:39:15 +01:00
pyproject.toml llm: first real-LLM prototype — recombining specialist LLMs (C2/C4) 2026-07-05 15:48:02 +01:00
README.md paper: reframe the perspective paper around sexual reproduction (v4 -> v5) 2026-07-05 13:53:10 +01:00
uv.lock Layer 1.5: architecture-general neural existence proof 2026-07-04 21:02:49 +01:00

The Lamarckian Society — Layer 1 (analytical core)

A parametric population-genetics model of knowledge transmission across generations of learning agents. Knowledge transmission is modelled literally as a WrightFisher process (not by analogy): a model's knowledge is a distribution p_t over K discrete items; a fixed true distribution p* has a rare tail; each generational step is "sample from the parent (drift) + mix in fresh real samples (grounding/immigration) + refit." Model collapse is the loss of rare alleles under drift.

See paper/blueprint.md (the normative build spec), paper/the-lamarckian-society-v5.md (the perspective paper), and paper/results-summary.md (a summary of all results).

Reproduce

Environment is a uv venv built from the committed, hash-pinned uv.lock — that lockfile is the single source of truth for "it runs" (Layer 1 is pure NumPy/SciPy and bitwise-reproducible from a seed; no container needed).

# one-time: install uv (https://astral.sh/uv)
curl -LsSf https://astral.sh/uv/install.sh | sh

uv sync                 # build .venv from uv.lock
make test               # correctness + scientific-validation tests (the spine of trust)
make layer1             # run experiments E1E6
make figures            # regenerate figures from committed results

Layout

src/knowledge/   Layer 1 package (imported as `knowledge`)
configs/layer1/  one YAML per experiment (E1..E6)
figures/         plot_EX.py — read results.parquet only
tests/           test_correctness.py + test_scientific_validation.py (analytic checks)
paper/           blueprint.md, perspective paper, figure_manifest.md
results/         written artifacts (gitignored; hashes tracked in manifest.json)