Function createF1Evaluator

createF1Evaluator<
RecordType extends ClassificationExample = ClassificationExample,
>(
options?: F1EvaluatorOptions,
): EvaluatorBase<RecordType>
Creates a code evaluator that computes the F1 score: the harmonic mean of precision and recall.

Supports binary classification (via positiveLabel, or auto-detected when labels are the numeric set {0, 1}) and multi-class classification (via the average strategy).
Type Parameters
- RecordType extends ClassificationExample = ClassificationExample
Parameters
- options: F1EvaluatorOptions = {}
Returns EvaluatorBase<RecordType>
Example
```
const f1 = createF1Evaluator();
const result = await f1.evaluate({
  expected: ["cat", "dog", "cat", "bird"],
  output: ["cat", "cat", "cat", "bird"],
});
// { score: 0.6 }
```
- Defined in code/createF1Evaluator.ts:28