<!--
{
  "availability" : [
    "Xcode: 27.0.0 -",
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "macCatalyst: 27.0.0 -",
    "macOS: 27.0.0 -",
    "visionOS: 27.0.0 -",
    "watchOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Evaluations",
  "identifier" : "/documentation/Evaluations/EvaluatorProtocol/metrics(subject:input:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Evaluations"
    ],
    "preciseIdentifier" : "s:11Evaluations17EvaluatorProtocolP7metrics7subject5inputSayAA6MetricVG7SubjectQz_5InputQztYaKF"
  },
  "title" : "metrics(subject:input:)"
}
-->

# metrics(subject:input:)

Computes metrics for the given subject, given the input sample.

```
nonisolated(nonsending) func metrics(subject: Self.Subject, input: Self.Input) async throws -> [Metric]
```

## Parameters

`subject`

The subject of evaluation, which the evaluation’s `subject(from:)` method produces.

`input`

The input sample that contains the expected value and other context.

## Return Value

An array of metrics this evaluator produces.

---

Copyright &copy; 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)