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# MLUpdateContext

The context an update task provides to your app’s completion and update progress handlers.

```
class MLUpdateContext
```

## Topics

### Getting the update context

[`event`](/documentation/CoreML/MLUpdateContext/event)

The event type that triggered an update task to notify your app’s completion and update progress handlers.

[`MLUpdateProgressEvent`](/documentation/CoreML/MLUpdateProgressEvent)

A type of event during a model update task.

[`task`](/documentation/CoreML/MLUpdateContext/task)

The update task that generated the update context.

[`parameters`](/documentation/CoreML/MLUpdateContext/parameters)

The parameters for the update task.

[`MLParameterKey`](/documentation/CoreML/MLParameterKey)

The keys for the parameter dictionary in a model configuration or a model update context.

### Evaluating the update

[`metrics`](/documentation/CoreML/MLUpdateContext/metrics)

The training metrics of the model for the update task, contained in a dictionary.

[`MLMetricKey`](/documentation/CoreML/MLMetricKey)

A key for the metrics dictionary in an update context.

### Saving an updated model

[`model`](/documentation/CoreML/MLUpdateContext/model)

The underlying Core ML model stored in memory.

[`MLWritable`](/documentation/CoreML/MLWritable)

A set of methods that saves a machine learning type to the file system.


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