Episode policy

Episode policy

Everything an episode is bounded and tuned by sits in one struct.

pub struct EpisodePolicy {
    pub turn_budget: u32,
    pub blind_round: bool,
    pub dominance_cap: u32,
    pub repetition_cap: u32,
    pub quorum: QuorumPolicy,
    pub weights: SalienceWeights,
}

The defaults

EpisodePolicy::DEFAULT = EpisodePolicy {
    turn_budget: 12,
    blind_round: true,
    dominance_cap: 50,
    repetition_cap: 3,
    quorum: QuorumPolicy { threshold: 2, window: 30, require_grounded: true },
    weights: SalienceWeights { recency: 5, importance: 30, relevance: 20, half_life: 20 },
};

The budget is deliberately small. Conformity in a group of language models rises with interaction time, so a long episode buys correlated error rather than better judgement.

The salience weights follow a memory-stream retrieval score. Where that implementation's paper and its code disagree, these follow the code, and decay is applied by rank in sequence rather than by elapsed time, which is what that implementation did and what a transcript with no clock can support.

Tune the threshold with the desk

The quorum threshold is the single most consequential setting, and it has a bound on each side. Five members, 5000 rooms, everything else held constant:

quorum	deadlocked	exhausted	decided %	correct %
2 of 5, below a majority	514	0	89.7	73.3
3 of 5, smallest majority	0	29	99.4	82.1
5 of 5, unanimity	0	2092	58.2	55.2

Below a majority, rooms deadlock. Five members can put two grounded supporters behind each of two options, and an episode where two options both carry is deadlocked by definition. No amount of further support resolves it, because both stay above the line. Requiring a majority makes that state unreachable and the deadlock rate falls to zero.

At unanimity, rooms cannot finish. Cross-inhibition removes a silenced advocate from a topic's supporter set and does not put them back, so a single grounded !object makes quorum unreachable for the rest of the episode. Two in five episodes then spend the whole budget without deciding.

So: a majority of the desk, and never the whole of it.

let threshold = (agents / 2 + 1).min(agents - 1);

A three-member desk is where this bites hardest, because a threshold of three there is unanimity. That case was found in a live room before it was measured.

Scale the budget with the desk too

A fixed budget makes a larger room look worse than a smaller one, and the effect is entirely an artifact of the cap. An eight-member room, 1500 rooms each:

budget	decided %	correct %	turns actually spent
12	65.3	63.1	10.36
16	89.6	82.9	10.96
20	94.5	86.3	11.24
24	96.4	87.7	11.42

A blind opening round costs one turn per member before anybody has seen anybody, a majority then has to assemble on one option, and the decision has to be recorded. Three turns per member covers that, and it is a cap rather than a cost: the eight-member room finishes in 11.4 of the 24 turns it is allowed. At five members, budgets of 15, 20 and 25 score 82.0, 82.1 and 82.1, so past the point where the room can finish, extra budget buys nothing.

Keep the blind round on

Five members, 5000 rooms:

opening round	decided %	correct %
blind	99.4	82.1
full visibility	100.0	58.0

With full visibility from the first turn the room cascades onto whatever was proposed first and lands level with a single agent. That is an information cascade, and Visibility::Blind is what prevents it.

Sweeping it yourself

cargo run --release -p tinyhivemind-hive --example bench -- --sweep

The grid is swept relative to desk size rather than in absolute numbers, since both consequential settings scale with the room. Benchmarks has the rest.