Behaviour Surprisal Analysis

Status: Production Ready (v3.0 - Cat# Integration) Trit: 0 (ERGODIC - measurement/observation) Principle: S(x) = -log₂(P(x|attention_mode)) Frame: Tri-channel prediction evaluation with AGM belief revision + Cat# bicomodule structure

Overview

Behaviour Surprisal Analysis calculates information-theoretic surprise between predictions and observed outcomes using three complementary attention channels mapped to Cat# = Comod(P) structure:

Channel	Trit	Home	Poly Op	Kan Role	Description
Direct (α)	−1	Span	× (product)	Ran_K	Exact artifact matching
Diffuse (β)	0	Prof	⊗ (parallel)	Adj	Thematic/structural matching
Meta (γ)	+1	Presheaves	◁ (substitution)	Lan_K	Capability/infrastructure tracking

Total Surprisal = α·S_direct + β·S_diffuse + γ·S_meta
where α + β + γ = 1 and typically α=0.3, β=0.5, γ=0.2

SDF Interleaving

This skill connects to Software Design for Flexibility (Hanson & Sussman, 2021):

Primary Chapter: 5. Evaluation

Concepts: eval, apply, interpreter, environment

GF(3) Balanced Triad

behaviour-surprisal-analysis (−) + SDF.Ch5 (−) + [balancer] (−) = 0

Skill Trit: -1 (MINUS - verification)

Secondary Chapters

Ch1: Flexibility through Abstraction
Ch4: Pattern Matching
Ch6: Layering
Ch10: Adventure Game Example

Connection Pattern

Evaluation interprets expressions. This skill processes or generates evaluable forms.

Cat# Integration (v3.0)

Galois Adjunction α ⊣ γ

The Direct and Meta channels form a Galois adjunction through the Diffuse bridge:

         α (abstract)
  Direct ─────────────→ Diffuse
    ↑                      │
    │        CatSharp      │ γ (concretize)
    │         Scale        │
    └──────────────────────┘
           Meta

  GF(3): (−1) + (0) + (+1) = 0 ✓

α (abstraction): Direct predictions → Diffuse patterns
γ (concretization): Diffuse patterns → Direct predictions
Unit η: id → γ∘α verifies coherence

Three Homes (Spivak ACT 2023)

Each channel lives in a specific Cat# home:

┌────────────┬─────────────┬──────────┬───────────────┬────────────┐
│  Channel   │  Poly Op    │ Kan Role │   Structure   │   Home     │
├────────────┼─────────────┼──────────┼───────────────┼────────────┤
│  Direct    │  × (prod)   │  Ran_K   │ cofree t_p    │   Span     │
│  Diffuse   │  ⊗ (para)   │  Adj     │ bicomodule    │   Prof     │
│  Meta      │  ◁ (subst)  │  Lan_K   │ free m_p      │ Presheaves │
└────────────┴─────────────┴──────────┴───────────────┴────────────┘

Bicomodule Coherence

Predictions and observations form bicomodule pairs. Coherence is verified by:

Galois unit check: η: id → γ∘α preserves trits
Bicomodule compatibility: pred_trit ↔ obs_trit compatible homes

CatSharp Scale Sonification

Surprisal values map to pitch classes via the CatSharp scale:

Trit	Pitch Classes	Chord Type	Hz Range
+1 (PLUS)	{0, 4, 8}	Augmented triad	C-E-G#
0 (ERGODIC)	{3, 6, 9}	Diminished 7th	D#-F#-A-C
−1 (MINUS)	{1,2,5,7,10,11}	Fifths cycle	C#,D,F,G,A#,B

;; Surprisal → Pitch class → Frequency
(defn surprisal->pitch-class [surp]
  (mod (Math/round (* (min surp 10.0) 1.2)) 12))

(defn pitch-class->freq [pc]
  (* 261.63 (Math/pow 2 (/ pc 12.0))))  ;; C4 = 261.63 Hz

Enable with --sonify flag to hear the surprisal as tones via sox.

AGM Belief Revision (Levi Identity)

Based on Baker 2023:

K * φ = (K − ¬φ) + φ   (Levi Identity)

Contraction (K − ¬φ): Remove predictions contradicted by observations
Expansion (+ φ): Add new beliefs from observed data
Revision (K * φ): Combined operation via Levi identity

Spohn κ-Ranking

Predictions ranked by entrenchment:

(defn kappa-rank [belief]
  (- (Math/log (/ 1 (max 0.01 (:confidence belief))))))

Lower κ = more entrenched = harder to revise.

Usage

# Full Cat# analysis with sonification
bb ~/.claude/skills/behaviour-surprisal-analysis/analyse.bb \
  --predictions predictions.json \
  --observed observed.json \
  --alpha 0.3 --beta 0.5 --gamma 0.2 \
  --sonify

# With capability tracking
bb analyse.bb \
  --predictions predictions.json \
  --observed observed.json \
  --skills-before skills_t0.txt \
  --skills-after skills_t30.txt

# Direct-heavy (Span home focus)
bb analyse.bb --alpha 0.7 --beta 0.2 --gamma 0.1

# Meta-heavy (Presheaves home focus)
bb analyse.bb --alpha 0.1 --beta 0.3 --gamma 0.6 --sonify

Input Format

{
  "predictions": {
    "direct": [
      {"content": "Ruby MCP SDK for skill markets", "confidence": 0.8},
      {"content": "VirtualizationBridge sandbox test", "confidence": 0.7}
    ],
    "diffuse": [
      {"theme": "GF(3) conservation", "keywords": ["trit", "lattice", "conservation"]},
      {"theme": "skill markets", "keywords": ["confidential", "commitment", "beacon"]}
    ],
    "meta": {
      "skills_before": 45,
      "mcp_servers_before": 12,
      "config_hash": "a3f2c1"
    }
  },
  "observed": {
    "threads": [
      "Ruby MCP SDK for confidential skill markets",
      "GF(3) skill composition and Galois connection verification",
      "Derangement operators and GF(3) entropy management"
    ],
    "capability_events": [
      {"type": "skill_install", "count": 373, "source": "plurigrid/asi"},
      {"type": "mcp_addition", "server": "world_a_aptos"}
    ]
  }
}

Output Format

╔══════════════════════════════════════════════════════════════════╗
║  BEHAVIOUR SURPRISAL ANALYSIS v3.0 (Cat# + AGM)                  ║
║  α=0.30 (Span/Ran) β=0.50 (Prof/Adj) γ=0.20 (Presh/Lan)          ║
╚══════════════════════════════════════════════════════════════════╝

  DIRECT ATTENTION (Home: Span, Kan: Ran_K)
  ───────────────────────────────────────────────────────────────
  Prediction                      │ Match │ S_dir │ Trit │ PC │ Home
  ────────────────────────────────┼───────┼───────┼──────┼────┼─────
  VirtualizationBridge sandbox    │  34.9% │  1.52 │  +   │  2 │ Span
  ...

  CAT# COHERENCE
  ───────────────────────────────────────────────────────────────
  Galois adjunction α ⊣ γ:    ✓ coherent
  Bicomodule compatibility:   85.0% (✓)

  CATSHARP SONIFICATION
  ───────────────────────────────────────────────────────────────
  ♪ Direct (Ran_K): 293.7 Hz
  ♪ Diffuse (Adj): 329.6 Hz
  ♪ Meta (Lan_K): 261.6 Hz

GF(3) Triads

The skill participates in balanced triads:

behaviour-surprisal-analysis (0) ⊗ catsharp-galois (0) ⊗ gay-mcp (-1) + operad-compose (+1) = 0 ✓

# Internal channel triad
Direct (−1) + Diffuse (0) + Meta (+1) = 0 ✓

Attention Calibration

Prediction Style	Recommended (α,β,γ)	Cat# Focus
Specific artifacts	(0.6, 0.3, 0.1)	Span heavy
Thematic directions	(0.2, 0.6, 0.2)	Prof heavy
Capability exploration	(0.2, 0.3, 0.5)	Presheaves heavy
Mixed/balanced	(0.3, 0.5, 0.2)	Bicomodule equilibrium

API

(require '[behaviour-surprisal-analysis :as bsa])

;; Full Cat# analysis
(bsa/combined-analysis
  predictions observed
  0.3 0.5 0.2          ;; α β γ
  before-state after-state
  capability-events
  true)                ;; sonify?

;; Galois adjunction verification
(bsa/verify-galois-unit direct-result)

;; Bicomodule coherence check
(bsa/check-bicomodule-coherence direct diffuse meta)

;; Sonify channel
(bsa/sonify-channel results "Direct" 0.3)

Philosophical Foundation

The tri-channel Cat# model reflects:

Cat# Three Homes: Span (comodules), Prof (bimodules), Presheaves (right modules)
Kan Extensions: Ran_K (limit/consume), Lan_K (colimit/generate), Adj (bridge)
Galois Adjunction: α ⊣ γ for abstraction/concretization
AGM Epistemology: Contraction, Expansion, Revision via Levi identity
CatSharp Scale: Mazzola's categorical music theory for sonification

Key Insight: GF(3) = Naturality

GF(3) conservation IS the naturality condition of Cat# equipment:

For a triad (s₋₁, s₀, s₊₁):
  Ran_K(s₋₁) →[bicomodule]→ s₀ →[bicomodule]→ Lan_K(s₊₁)
  
  The commuting square:
    G(f) ∘ η_A = η_B ∘ F(f)
    
  Becomes the GF(3) equation:
    (−1) + (0) + (+1) ≡ 0 (mod 3)

Skill Name: behaviour-surprisal-analysis Version: 3.0.0 (Cat# Integration) Type: Prediction Evaluation / Information Theory / Belief Revision / Category Theory Trit: 0 (ERGODIC) GF(3): Conserved via Cat# bicomodule structure Dependencies: sox (optional, for sonification) Sources:

behaviour-surprisal-analysis