Jesse_Chen
51 lines
2.4 KiB
TypeScript
51 lines
2.4 KiB
TypeScript
import type { CandidateResult } from "./birth-time-evidence.ts";
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export type DynamicStopInput = {
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readonly result: CandidateResult | null;
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readonly effectiveAnswer: boolean;
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readonly previousResult: CandidateResult | null;
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readonly priorPlateauCount: number;
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readonly usefulOpportunityCount: number;
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readonly repeatedOnly: boolean;
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readonly effectiveAnswerCount: number;
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readonly forcedReason: "user_finished" | "generation_unavailable" | null;
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};
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export type DynamicStopDecision =
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readonly kind: "finish";
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readonly reason: "user_finished" | "generation_unavailable" | "high_confidence" | "safety_cap" | "plateau" | "no_information_gain" | "repeated_partition";
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readonly plateauCount: number;
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}
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| { readonly kind: "continue"; readonly plateauCount: number };
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export function materiallyChanged(
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previousResult: CandidateResult | null,
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result: CandidateResult,
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): boolean {
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if (previousResult === null) return true;
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const previousRange = previousResult.winningSegment;
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const nextRange = result.winningSegment;
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const rangeChanged = previousRange === null || nextRange === null
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? previousRange !== nextRange
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: previousRange.startTime !== nextRange.startTime
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|| previousRange.endTime !== nextRange.endTime
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|| previousRange.representativeTime !== nextRange.representativeTime;
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return rangeChanged || Math.abs(previousResult.marginPercent - result.marginPercent) >= 2;
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}
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export function decideDynamicStop(input: DynamicStopInput): DynamicStopDecision {
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const plateauCount = input.effectiveAnswer && input.result !== null
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? materiallyChanged(input.previousResult, input.result) ? 0 : input.priorPlateauCount + 1
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: input.priorPlateauCount;
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if (input.forcedReason !== null) return { kind: "finish", reason: input.forcedReason, plateauCount };
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if (input.result?.confidence === "high" && input.result.canApply) {
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return { kind: "finish", reason: "high_confidence", plateauCount };
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}
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if (input.effectiveAnswerCount >= 10) return { kind: "finish", reason: "safety_cap", plateauCount };
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if (plateauCount >= 2) return { kind: "finish", reason: "plateau", plateauCount };
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if (input.usefulOpportunityCount === 0) return { kind: "finish", reason: "no_information_gain", plateauCount };
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if (input.repeatedOnly) return { kind: "finish", reason: "repeated_partition", plateauCount };
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return { kind: "continue", plateauCount };
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}
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