fix: smoothing factor into the coherence score

Author: kemuru

subgraph/core/src/KlerosCore.ts

@@ -19,7 +19,7 @@ import { createDisputeKitFromEvent, filterSupportedDisputeKits } from "./entitie
 import { createDisputeFromEvent } from "./entities/Dispute";
 import { createRoundFromRoundInfo, updateRoundTimeline } from "./entities/Round";
 import { updateCases, updateCasesAppealing, updateCasesRuled, updateCasesVoting } from "./datapoint";
-import { addUserActiveDispute, ensureUser } from "./entities/User";
+import { addUserActiveDispute, computeCoherenceScore, ensureUser } from "./entities/User";
 import { updateJurorStake } from "./entities/JurorTokensPerCourt";
 import { createDrawFromEvent } from "./entities/Draw";
 import { updateTokenAndEthShiftFromEvent } from "./entities/TokenAndEthShift";
@@ -156,8 +156,7 @@ export function handleNewPeriod(event: NewPeriod): void {
 
         // Recalculate coherenceScore
         if (juror.totalResolvedVotes.gt(ZERO)) {
-          const coherenceScore = juror.totalCoherentVotes.times(BigInt.fromI32(100)).div(juror.totalResolvedVotes);
-          juror.coherenceScore = coherenceScore;
+          juror.coherenceScore = computeCoherenceScore(juror.totalCoherentVotes, juror.totalResolvedVotes);
         }
 
         juror.save();

subgraph/core/src/entities/User.ts

@@ -1,6 +1,20 @@
+import { BigInt, BigDecimal } from "@graphprotocol/graph-ts";
 import { User } from "../../generated/schema";
 import { ONE, ZERO } from "../utils";
 
+export function computeCoherenceScore(totalCoherentVotes: BigInt, totalResolvedVotes: BigInt): BigInt {
+  const smoothingFactor = BigDecimal.fromString("10");
+
+  let denominator = totalResolvedVotes.toBigDecimal().plus(smoothingFactor);
+  let coherencyRatio = totalCoherentVotes.toBigDecimal().div(denominator);
+
+  const coherencyScore = coherencyRatio.times(BigDecimal.fromString("100"));
+
+  const roundedScore = coherencyScore.plus(BigDecimal.fromString("0.5"));
+
+  return BigInt.fromString(roundedScore.toString().split(".")[0]);
+}
+
 export function ensureUser(id: string): User {
   const user = User.load(id);
 

subgraph/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@kleros/kleros-v2-subgraph",
-  "version": "0.7.5",
+  "version": "0.7.6",
   "license": "MIT",
   "scripts": {
     "update:core:arbitrum-sepolia-devnet": "./scripts/update.sh arbitrumSepoliaDevnet arbitrum-sepolia core/subgraph.yaml",