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}
```
### Using Extra Metadata
The `extra` field provides context without affecting scoring:
```typescript
{
input: "Summarize this article",
expected: "Key points of the article...",
extra: {
articleLength: 500,
domain: "technology",
tags: ["ai", "machine-learning"],
sourceUrl: "https://example.com/article",
testPriority: "high"
}
}
```
## Dataset Registration
Register datasets for reuse across experiments:
```typescript
// register-datasets.ts
import { registerExperimentDataset } from "@voltagent/evals";
import mathDatasetJson from "./.voltagent/datasets/math-problems.json";
import qaDatasetJson from "./data/qa-pairs.json";
// Register a JSON dataset
registerExperimentDataset({
name: "math-problems",
items: mathDatasetJson.data,
});
// Register another JSON dataset
registerExperimentDataset({
name: "qa-pairs",
items: qaDatasetJson.data,
});
// Register with VoltOps integration
registerExperimentDataset({
name: "production-qa",
descriptor: {
id: "dataset_abc123",
versionId: "version_xyz789",
},
});
// Register with async data loader
registerExperimentDataset({
name: "dynamic-dataset",
resolver: async ({ limit, signal }) => {
// Load data from API, database, etc.
const response = await fetch("https://api.example.com/test-data", { signal });
const data = await response.json();
return {
items: limit ? data.items.slice(0, limit) : data.items,
total: data.total,
};
},
});
```
## Advanced Dataset Features
### Async Dataset Resolvers
Load datasets dynamically with resolver functions:
```typescript
registerExperimentDataset({
name: "api-dataset",
resolver: async ({ limit, signal }) => {
// Parameters:
// - limit: Maximum items requested
// - signal: AbortSignal for cancellation
const items = await loadFromDatabase(limit);
return {
items, // Array or AsyncIterable of items
total: await getTotalCount(), // Optional total hint
dataset: {
// Optional metadata
id: "db-dataset-1",
name: "Database Dataset",
metadata: { source: "postgres" },
},
};
},
});
```
<|endoftext|>
# source: VoltAgent__voltagent/website/evaluation-docs/cli-reference.md type: docs
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