ai.djl.basicdataset.cv.classification

Class AbstractImageFolder

java.lang.Object

ai.djl.training.dataset.RandomAccessDataset

ai.djl.basicdataset.cv.ImageDataset

ai.djl.basicdataset.cv.classification.ImageClassificationDataset

ai.djl.basicdataset.cv.classification.AbstractImageFolder

All Implemented Interfaces:

ai.djl.training.dataset.Dataset

Direct Known Subclasses:

ImageFolder, ImageNet

public abstract class AbstractImageFolder
extends ImageClassificationDataset

A dataset for loading image files stored in a folder structure.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractImageFolder.ImageFolderBuilder<T extends AbstractImageFolder.ImageFolderBuilder<T>> Used to build an AbstractImageFolder.

Nested classes/interfaces inherited from class ai.djl.basicdataset.cv.ImageDataset

ImageDataset.BaseBuilder<T extends ImageDataset.BaseBuilder<T>>

Nested classes/interfaces inherited from interface ai.djl.training.dataset.Dataset

ai.djl.training.dataset.Dataset.Usage

Field Summary

Fields

Modifier and Type	Field and Description
protected ai.djl.util.PairList<java.lang.String,java.lang.Integer>	items
protected boolean	prepared
protected ai.djl.repository.Resource	resource
protected java.util.List<java.lang.String>	synset

Fields inherited from class ai.djl.basicdataset.cv.ImageDataset

flag

Fields inherited from class ai.djl.training.dataset.RandomAccessDataset

dataBatchifier, device, labelBatchifier, limit, pipeline, prefetchNumber, sampler, targetPipeline

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractImageFolder(AbstractImageFolder.ImageFolderBuilder<?> builder)

Method Summary

Modifier and Type	Method and Description
protected long	availableSize()
java.util.List<java.lang.String>	getClasses() Returns the classes that the images in the dataset are classified into.
protected long	getClassNumber(long index) Returns the class of the data item at the given index.
protected ai.djl.modality.cv.Image	getImage(long index) Returns the image at the given index in the dataset.
java.util.Optional<java.lang.Integer>	getImageHeight() Returns the height of the images in the dataset.
protected abstract java.nio.file.Path	getImagePath(java.lang.String key)
java.util.Optional<java.lang.Integer>	getImageWidth() Returns the width of the images in the dataset.
java.util.List<java.lang.String>	getSynset() Returns the synsets of the ImageFolder dataset.
protected void	listImages(java.nio.file.Path root, java.util.List<java.lang.String> classes)

Methods inherited from class ai.djl.basicdataset.cv.classification.ImageClassificationDataset

get, makeTranslator

Methods inherited from class ai.djl.basicdataset.cv.ImageDataset

getImageChannels, getRecordImage

Methods inherited from class ai.djl.training.dataset.RandomAccessDataset

getData, getData, getData, getData, randomSplit, size, subDataset, toArray

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ai.djl.training.dataset.Dataset

prepare, prepare

Field Detail

synset

protected java.util.List<java.lang.String> synset

items

protected ai.djl.util.PairList<java.lang.String,java.lang.Integer> items

resource

protected ai.djl.repository.Resource resource

prepared

protected boolean prepared

Constructor Detail

AbstractImageFolder

protected AbstractImageFolder(AbstractImageFolder.ImageFolderBuilder<?> builder)

Method Detail

getImage

protected ai.djl.modality.cv.Image getImage(long index)
                                     throws java.io.IOException

Returns the image at the given index in the dataset.

Specified by:

getImage in class ImageDataset

Parameters:

index - the index (if the dataset is a list of data items)

Returns:

the image

Throws:

java.io.IOException - if the image could not be loaded

getClassNumber

protected long getClassNumber(long index)

Returns the class of the data item at the given index.

Specified by:

getClassNumber in class ImageClassificationDataset

Parameters:

index - the index (if the dataset is a list of data items)

Returns:

the class number or the index into the list of classes of the desired class name

availableSize

protected long availableSize()

Specified by:

availableSize in class ai.djl.training.dataset.RandomAccessDataset

getSynset

public java.util.List<java.lang.String> getSynset()
                                           throws java.io.IOException,
                                                  ai.djl.translate.TranslateException

Returns the synsets of the ImageFolder dataset.

Returns:

a list that contains synsets

Throws:

java.io.IOException - for various exceptions depending on the dataset

ai.djl.translate.TranslateException - if there is an error while processing input

listImages

protected void listImages(java.nio.file.Path root,
                          java.util.List<java.lang.String> classes)

getImagePath

protected abstract java.nio.file.Path getImagePath(java.lang.String key)

getImageWidth

public java.util.Optional<java.lang.Integer> getImageWidth()

Returns the width of the images in the dataset.

Specified by:

getImageWidth in class ImageDataset

Returns:

the width of the images in the dataset

getImageHeight

public java.util.Optional<java.lang.Integer> getImageHeight()

Returns the height of the images in the dataset.

Specified by:

getImageHeight in class ImageDataset

Returns:

the height of the images in the dataset

getClasses

public java.util.List<java.lang.String> getClasses()

Returns the classes that the images in the dataset are classified into.

Specified by:

getClasses in class ImageClassificationDataset

Returns:

the classes that the images in the dataset are classified into