Audit frozen LIF semantics and real recurrent motifs without learning changes

2026-09-30 01:00:16 +08:00
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+# Phase 4AC — LIF semantics and unchanged-dynamics motif audit
+
+Status: COMPLETE-SEMANTICS-AUDIT / LEARNING-NOT-ACHIEVED.
+No alternative dynamics deployed to MaleCNS; no conditioning, learned candidate or new formal runtime.
+
+## Author model versus frozen adapted model
+
+Pinned author model resets g on a spike and declares v/g `(unless refractory)`, uses linear integration, strict > threshold and voltage Poisson input with zero refractory on stimulated cells.
+The frozen adapted model retains g, decays/accepts events during refractory, uses explicit Euler and >= threshold, and forced sensory spikes respect refractory.
+These are documented model choices, not a newly established GPU regression. g is an additive voltage-valued drive, not a measured conductance.
+W_syn=0.275 is transferred from a free parameter calibrated in the original FlyWire feeding model, not a measured universal MaleCNS synaptic efficacy.
+
+## Synthetic single-cell component tests
+
+All impulse amplitudes derive from the complete unique contact counts of the predeclared 13 real motif edges plus a one-contact fixture; other boundary/sustained cases are explicitly synthetic unit tests.
+These ablations retain frozen Euler arithmetic/scheduling and are NOT complete Brian2 replication. No successful amplitude or policy was selected after seeing results.
+
+| Single-impulse fixture | Frozen | Reset g only | Refractory gate only | Reset + gate |
+|---|---:|---:|---:|---:|
+| one_impulse_contacts_1 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_104 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_172 | 1 | 1 | 1 | 1 |
+| one_impulse_contacts_210 | 1 | 1 | 1 | 1 |
+| one_impulse_contacts_226 | 1 | 1 | 1 | 1 |
+| one_impulse_contacts_235 | 1 | 1 | 1 | 1 |
+| one_impulse_contacts_259 | 1 | 1 | 1 | 1 |
+| one_impulse_contacts_283 | 1 | 1 | 2 | 1 |
+| one_impulse_contacts_43 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_57 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_64 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_70 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_76 | 0 | 0 | 0 | 0 |
+| one_impulse_contacts_95 | 0 | 0 | 0 | 0 |
+
+Reset-only and combined policies can produce at most one spike from a single isolated input by construction. This does not establish biological correctness or whole-brain learning improvement.
+
+## Real anatomical motifs — frozen mathematics ONLY
+
+One forced seed spike at step 0 except the no-input control; no subsequent input; observed for 1 s. Late window=500–1,000 ms.
+The recurrent pair/trio/five are induced subgraphs. The feedforward control selects four existing edges and removes feedback only within this isolated diagnostic harness.
+External inhibition, graded APL and other whole-brain inputs are absent. A sustained isolated motif is evidence of sufficiency in this harness, NOT necessity in the complete brain.
+
+| Motif | neuron_idx | Total spikes | Late spikes | Last ms |
+|---|---:|---:|---:|---:|
+| pair | 1381 | 237 | 119 | 999.3 |
+| pair | 1511 | 236 | 119 | 997.5 |
+| trio | 1197 | 355 | 179 | 999.3 |
+| trio | 1381 | 355 | 178 | 997.8 |
+| trio | 1511 | 354 | 178 | 997.4 |
+| five | 1197 | 370 | 185 | 998.8 |
+| five | 1381 | 369 | 185 | 997.4 |
+| five | 1511 | 367 | 186 | 999.5 |
+| five | 82312 | 80 | 41 | 990.3 |
+| five | 133666 | 297 | 150 | 999.5 |
+| feedforward | 1197 | 1 | 0 | 10.0 |
+| feedforward | 1381 | 1 | 0 | 0.0 |
+| feedforward | 1511 | 1 | 0 | 4.9 |
+| feedforward | 82312 | 0 | 0 | none |
+| feedforward | 133666 | 0 | 0 | none |
+| no_input | 1197 | 0 | 0 | none |
+| no_input | 1381 | 0 | 0 | none |
+| no_input | 1511 | 0 | 0 | none |
+| no_input | 82312 | 0 | 0 | none |
+| no_input | 133666 | 0 | 0 | none |
+
+## Verification and boundaries
+
+Seven unit tests; all five real motifs CPU/GPU event, count, final V/g/refractory, queue and timestep history exact; five archived deterministic-v2 full-brain trials exact.
+Every selected edge_id, source CSR row, destination and original weight validated; generated prepared inputs hashed. All original snapshot files and Phase 4AA/4AB model/experiment manifests checked before and after.
+Diagnostic wall time including compilation and observation: 95.398 s. Peak allocated process VRAM: 285994496 bytes. Not a runtime-speed benchmark.
+Original author code was inspected, not executed; no Brian2 oracle run and no new package installation. ComfyUI was not stopped or unloaded.
+
+## Decision
+
+The usable-learning gate remains unmet: independent evaluation, A-vs-neutral-B specificity in MBON/downstream, multiple training seeds and conditioning controls still required.
+Before any full-network alternative, obtain explicit separate model authorization and distinguish each semantic component; do not claim g reset alone reproduces the author implementation.
+No evidence here permits changing eta, thresholds, gain, frozen APL calibration, transmitter signs or the plastic mask.
+
+## Primary provenance
+
+[Shiu et al. 2024](https://www.nature.com/articles/s41586-024-07763-9)
+[Pinned author implementation](https://github.com/philshiu/Drosophila_brain_model/blob/91bdd1e7dcf193f3e7ca5a8933497fcef63b7960/model.py)
+Downloaded source, MIT license, environment specification, exact commit, SHA-256 and source clauses retained under external-resources and audit.