ImageResizingEstimator Class

Definition

Namespace:

Microsoft.ML.Transforms.Image

Assembly:

Microsoft.ML.ImageAnalytics.dll

Package:

Microsoft.ML.ImageAnalytics v3.0.1

IEstimator<TTransformer> for the ImageResizingTransformer.

public sealed class ImageResizingEstimator : Microsoft.ML.Data.TrivialEstimator<Microsoft.ML.Transforms.Image.ImageResizingTransformer>

type ImageResizingEstimator = class
    inherit TrivialEstimator<ImageResizingTransformer>

Public NotInheritable Class ImageResizingEstimator
Inherits TrivialEstimator(Of ImageResizingTransformer)

Inheritance

Object

TrivialEstimator<ImageResizingTransformer>

ImageResizingEstimator

Remarks

Estimator Characteristics

Does this estimator need to look at the data to train its parameters?	No
Input column data type	MLImage
Output column data type	MLImage
Required NuGet in addition to Microsoft.ML	Microsoft.ML.ImageAnalytics
Exportable to ONNX	No

The resulting ImageResizingTransformer creates a new column, named as specified in the output column name parameters, and resizes the data from the input column to this new column.

In image processing pipelines, often machine learning practitioner make use of pre-trained DNN featurizers to extract features for usage in the machine learning algorithms. Those pre-trained models have a defined width and height for their input images, so often, after getting loaded, the images will need to get resized before further processing. For end-to-end image processing pipelines, and scenarios in your applications, see the examples in the machinelearning-samples github repository.

Check the See Also section for links to usage examples.

Methods

Fit(IDataView)	(Inherited from TrivialEstimator<TTransformer>)
GetOutputSchema(SchemaShape)	Returns the SchemaShape of the schema which will be produced by the transformer. Used for schema propagation and verification in a pipeline.

Extension Methods

AppendCacheCheckpoint<TTrans>(IEstimator<TTrans>, IHostEnvironment)

Append a 'caching checkpoint' to the estimator chain. This will ensure that the downstream estimators will be trained against cached data. It is helpful to have a caching checkpoint before trainers that take multiple data passes.

WithOnFitDelegate<TTransformer>(IEstimator<TTransformer>, Action<TTransformer>)

Given an estimator, return a wrapping object that will call a delegate once Fit(IDataView) is called. It is often important for an estimator to return information about what was fit, which is why the Fit(IDataView) method returns a specifically typed object, rather than just a general ITransformer. However, at the same time, IEstimator<TTransformer> are often formed into pipelines with many objects, so we may need to build a chain of estimators via EstimatorChain<TLastTransformer> where the estimator for which we want to get the transformer is buried somewhere in this chain. For that scenario, we can through this method attach a delegate that will be called once fit is called.

See also

• ResizeImages(TransformsCatalog, String, Int32, Int32, String, ImageResizingEstimator+ResizingKind, ImageResizingEstimator+Anchor)