harn-stdlib 0.10.67

Embedded Harn standard library source catalog
Documentation 
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/** Registered evidence policies for hypothesis compilation. */
import {
  EvidenceMode,
  EvidencePolicy,
  ExperimentResourceBudget,
  OutcomeAdapter,
} from "std/eval/hypothesis/contracts"

fn __ladder(minimum: int, maximum: int) -> list<int> {
  const middle = min(maximum, max(minimum + 1, minimum * 2))
  let ladder = [minimum]
  if middle > minimum && middle < maximum {
    ladder = ladder + [middle]
  }
  if maximum > minimum {
    ladder = ladder + [maximum]
  }
  return ladder
}

/**
 * Resolve a named evidence mode into transparent statistical and promotion
 * semantics. Priors are intentionally absent: belief does not change a
 * decision threshold.
 *
 * @effects: []
 * @errors: []
 * @api_stability: experimental
 */
pub fn resolve_evidence_policy(
  mode: EvidenceMode,
  primary: OutcomeAdapter?,
  budget: ExperimentResourceBudget,
) -> EvidencePolicy {
  const width = if primary == nil {
    1.0
  } else {
    primary.bounds.hi - primary.bounds.lo
  }
  const ladder = __ladder(budget.min_trials_per_case, budget.max_trials_per_case)
  if mode == "scout" {
    return {
      schema: "harn.evidence.policy.v1",
      id: "harn.evidence.scout.v1",
      mode: mode,
      claim_ceiling: "bounded_simulation",
      delta: 0.2,
      epsilon: width * 0.05,
      ladder: ladder,
      adaptive: true,
      promotion: "explicit_gate",
    }
  }
  if mode == "confirmatory" {
    return {
      schema: "harn.evidence.policy.v1",
      id: "harn.evidence.confirmatory.v1",
      mode: mode,
      claim_ceiling: "randomized_causal",
      delta: 0.01,
      epsilon: width * 0.02,
      ladder: ladder,
      adaptive: true,
      promotion: "explicit_gate",
    }
  }
  if mode == "observational" {
    return {
      schema: "harn.evidence.policy.v1",
      id: "harn.evidence.observational.v1",
      mode: mode,
      claim_ceiling: "associational",
      delta: nil,
      epsilon: nil,
      ladder: [],
      adaptive: false,
      promotion: "none",
    }
  }
  return {
    schema: "harn.evidence.policy.v1",
    id: "harn.evidence.standard_sequential.v1",
    mode: "standard_sequential",
    claim_ceiling: "randomized_causal",
    delta: 0.05,
    epsilon: width * 0.02,
    ladder: ladder,
    adaptive: true,
    promotion: "explicit_gate",
  }
}