# pairwise(_:scale:judge:scoringMode:evaluationTarget:) Creates a pairwise comparison evaluator that compares the model’s response against the sample’s expected value. ``` static func pairwise(_ name: String, scale: ScoringScale, judge: any LanguageModel, scoringMode: ScoringMode = .discrete, evaluationTarget: (@Sendable (Input.ExpectedValue) -> String)? = nil) -> ModelJudgeEvaluator ``` ## Parameters `name` The metric name that corresponds to the DataFrame column. `scale` Scoring scale for the comparison. `judge` The language model to use as judge. `scoringMode` A value that indicates whether scores are discrete (default) or allow any floating-point value. `evaluationTarget` An optional closure that converts the value to a string. Both responses use this target. ## Discussion The judge sees the model’s output under “Response” and the expected value from `input.expected` under “Baseline Response” in the Context section. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)