resnext50_32x4d

torchvision.models.resnext50_32x4d(*, weights: Optional[ResNeXt50_32X4D_Weights] = None, progress: bool = True, **kwargs: Any) → ResNet

ResNeXt-50 32x4d model from Aggregated Residual Transformation for Deep Neural Networks.

Parameters:

• weights (ResNeXt50_32X4D_Weights, optional) – The pretrained weights to use. See ResNext50_32X4D_Weights below for more details, and possible values. By default, no pre-trained weights are used.

• progress (bool, optional) – If True, displays a progress bar of the download to stderr. Default is True.

• **kwargs – parameters passed to the torchvision.models.resnet.ResNet base class. Please refer to the source code for more details about this class.

class torchvision.models.ResNeXt50_32X4D_Weights(value)

The model builder above accepts the following values as the weights parameter. ResNeXt50_32X4D_Weights.DEFAULT is equivalent to ResNeXt50_32X4D_Weights.IMAGENET1K_V2. You can also use strings, e.g. weights='DEFAULT' or weights='IMAGENET1K_V1'.

ResNeXt50_32X4D_Weights.IMAGENET1K_V1:

These weights reproduce closely the results of the paper using a simple training recipe.

acc@1 (on ImageNet-1K)	77.618
acc@5 (on ImageNet-1K)	93.698
min_size	height=1, width=1
categories	tench, goldfish, great white shark, … (997 omitted)
num_params	25028904
recipe	link
GFLOPS	4.23
File size	95.8 MB

The inference transforms are available at ResNeXt50_32X4D_Weights.IMAGENET1K_V1.transforms and perform the following preprocessing operations: Accepts PIL.Image, batched (B, C, H, W) and single (C, H, W) image torch.Tensor objects. The images are resized to resize_size=[256] using interpolation=InterpolationMode.BILINEAR, followed by a central crop of crop_size=[224]. Finally the values are first rescaled to [0.0, 1.0] and then normalized using mean=[0.485, 0.456, 0.406] and std=[0.229, 0.224, 0.225].

ResNeXt50_32X4D_Weights.IMAGENET1K_V2:

These weights improve upon the results of the original paper by using TorchVision’s new training recipe. Also available as ResNeXt50_32X4D_Weights.DEFAULT.

acc@1 (on ImageNet-1K)	81.198
acc@5 (on ImageNet-1K)	95.34
min_size	height=1, width=1
categories	tench, goldfish, great white shark, … (997 omitted)
num_params	25028904
recipe	link
GFLOPS	4.23
File size	95.8 MB

The inference transforms are available at ResNeXt50_32X4D_Weights.IMAGENET1K_V2.transforms and perform the following preprocessing operations: Accepts PIL.Image, batched (B, C, H, W) and single (C, H, W) image torch.Tensor objects. The images are resized to resize_size=[232] using interpolation=InterpolationMode.BILINEAR, followed by a central crop of crop_size=[224]. Finally the values are first rescaled to [0.0, 1.0] and then normalized using mean=[0.485, 0.456, 0.406] and std=[0.229, 0.224, 0.225].