---
title: contentLossKey
framework: createml
role: symbol
role_heading: Type Property
path: createml/mlprogress/contentlosskey
---

# contentLossKey

The key that accesses the content image loss value.

## Declaration

```swift
static let contentLossKey: ProgressUserInfoKey
```

## See Also

### Accessing style transfer metrics

- [styleLossKey](createml/mlprogress/stylelosskey.md)
- [stylizedImageKey](createml/mlprogress/stylizedimagekey.md)