torchvision

torchvision是一個包，它服務于pytorch深度學習架構，用來生成圖檔，視訊資料集，模型類和預訓練的模型

torchvision由以下四個部分組成:

1. torchvision.datasets : Data loaders for popular vision datasets

2. torchvision.models : Definitions for popular model architectures, such as AlexNet, VGG, and ResNet and pre-trained models.

3. torchvision.transforms : Common image transformations such as random crop, rotations etc.

4. torchvision.utils : Useful stuff such as saving tensor (3 x H x W) as image to disk, given a mini-batch creating a grid of images, etc.

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