# init(_:scale:judge:scoringMode:prompt:) Creates a single-metric evaluator with a custom judge prompt. ``` init(_ name: String, scale: ScoringScale, judge: any LanguageModel, scoringMode: ScoringMode = .discrete, prompt: ModelJudgePrompt) ``` ## Parameters `name` The metric name that corresponds to the DataFrame column. `scale` The scoring scale for this metric. `judge` The language model to use as judge. `scoringMode` A value that indicates whether scores are discrete (default) or allow any floating-point value. `prompt` Configuration for the judge prompt, including instructions, response presentation, and reference. --- 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)