Image Classification Datasets Overview

Dataset format

The folder structure for classification datasets in torchvision typically follows a standard format:

root/
|-- class1/
|   |-- img1.jpg
|   |-- img2.jpg
|   |-- ...
|
|-- class2/
|   |-- img1.jpg
|   |-- img2.jpg
|   |-- ...
|
|-- class3/
|   |-- img1.jpg
|   |-- img2.jpg
|   |-- ...
|
|-- ...

In this folder structure, the root directory contains one subdirectory for each class in the dataset. Each subdirectory is named after the corresponding class and contains all the images for that class. Each image file is named uniquely and is typically in a common image file format such as JPEG or PNG.

Example

For example, in the CIFAR10 dataset, the folder structure would look like this:

cifar-10-/
|
|-- train/
|   |-- airplane/
|   |   |-- 10008_airplane.png
|   |   |-- 10009_airplane.png
|   |   |-- ...
|   |
|   |-- automobile/
|   |   |-- 1000_automobile.png
|   |   |-- 1001_automobile.png
|   |   |-- ...
|   |
|   |-- bird/
|   |   |-- 10014_bird.png
|   |   |-- 10015_bird.png
|   |   |-- ...
|   |
|   |-- ...
|
|-- test/
|   |-- airplane/
|   |   |-- 10_airplane.png
|   |   |-- 11_airplane.png
|   |   |-- ...
|   |
|   |-- automobile/
|   |   |-- 100_automobile.png
|   |   |-- 101_automobile.png
|   |   |-- ...
|   |
|   |-- bird/
|   |   |-- 1000_bird.png
|   |   |-- 1001_bird.png
|   |   |-- ...
|   |
|   |-- ...

In this example, the train directory contains subdirectories for each class in the dataset, and each class subdirectory contains all the images for that class. The test directory has a similar structure. The root directory also contains other files that are part of the CIFAR10 dataset.

Usage

from ultralytics import YOLO

# Load a model
model = YOLO('yolov8n-cls.pt')  # load a pretrained model (recommended for training)

# Train the model
model.train(data='path/to/dataset', epochs=100, imgsz=640)

# Start training from a pretrained *.pt model
yolo detect train data=path/to/data model=yolov8n-seg.pt epochs=100 imgsz=640

Supported Datasets

TODO

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