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# VNConfidence

A type alias for the confidence value of an observation.

```
typealias VNConfidence = Float
```

## Discussion

The Vision framework normalizes this value to `[0.0, 1.0]` under most circumstances. A value of `0.0` indicates no confidence. A value of `1.0` indicates highest confidence, or the observation doesn’t support or assign meaning to confidence.

> Note:
> When the results come from a ``doc://Vision/documentation/Vision/VNCoreMLRequest``, Vision forwards confidence values as-is and doesn’t normalize them.

---

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