{"record":{"id":"18211a4979d06eb4","repo":"affaan-m/ECC","slug":"minimum-mean-delta-must-be-finite","errorCode":null,"errorMessage":"minimum mean delta must be finite","messagePattern":"minimum mean delta must be finite","errorType":"validation","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"ecc2/src/harness_eval.rs","lineNumber":511,"sourceCode":"\n#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]\npub struct Comparison {\n    pub passed: bool,\n    pub sample_count: usize,\n    pub candidate_mean: f64,\n    pub baseline_mean: f64,\n    pub mean_delta: f64,\n    pub win_rate: f64,\n    pub failures: Vec<String>,\n}\n\nimpl PromotionPolicy {\n    pub fn validate(self) -> Result<()> {\n        if self.min_samples == 0 {\n            bail!(\"minimum samples must be positive\");\n        }\n        if !self.min_mean_delta.is_finite() {\n            bail!(\"minimum mean delta must be finite\");\n        }\n        if !self.min_win_rate.is_finite() || !(0.0..=1.0).contains(&self.min_win_rate) {\n            bail!(\"minimum win rate must be between 0 and 1\");\n        }\n        Ok(())\n    }\n\n    pub fn compare(self, samples: &[PairedSample]) -> Result<Comparison> {\n        self.validate()?;\n        if samples.is_empty() {\n            bail!(\"samples cannot be empty\");\n        }\n        if samples\n            .iter()\n            .map(|sample| sample.seed)\n            .collect::<BTreeSet<_>>()\n            .len()\n            != samples.len()","sourceCodeStart":493,"sourceCodeEnd":529,"githubUrl":"https://github.com/affaan-m/ECC/blob/06c5e118c4d3e6c3b7f9445f973a2194c82de193/ecc2/src/harness_eval.rs#L493-L529","documentation":"PromotionPolicy::validate rejects a min_mean_delta that is NaN or infinite. The threshold must be a finite number so the mean-delta comparison in compare() is deterministic; it fires on a corrupt or nonsensical policy value.","triggerScenarios":"Thrown at ecc2/src/harness_eval.rs:511 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Provide a finite number for minimum mean delta; NaN and Infinity are rejected.","Check the computation producing the delta for division by zero or overflow."],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"06c5e118c4d3e6c3b7f9445f973a2194c82de193","analyzedAt":"2026-08-18T11:27:13.915Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}