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Next-ViT

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Next-ViT

Category: Hybrid · Code: timm/models/nextvit.py · Architectures: 3 · Pretrained weights: 12 (12 with ImageNet-1k results)

Next-ViT is a hybrid CNN / transformer for efficient deployment, stacking Next Convolution Blocks (NCB) and Next Transformer Blocks (NTB).

Papers

Usage

See the Quickstart for loading pretrained weights, image preprocessing and fine-tuning, and Feature Extraction for using the models as backbones.

>>> import timm
>>> model = timm.create_model('nextvit_small.bd_in1k', pretrained=True)
>>> data_config = timm.data.resolve_model_data_config(model)

Model API support

FeatureNextViT
features_only=True feature maps✓ (strides 4, 8, 16, 32)
forward_intermediates()✓
prune_intermediate_layers()✓
Any input size, no changes needed✓
set_input_size()–
dynamic_img_size=True–
set_grad_checkpointing()✓
Layer-wise LR decay (group_matcher())✓
reset_classifier()✓

✓ supported, ✓ (square) works for square sizes only, ✗ not supported, – not needed (the model already accepts any input size). Checked by running each feature on a randomly initialized model (NextViT with nextvit_small at 224), other architectures of the same class are expected to behave the same. See the Model API page for details.

Architectures

ArchitectureParams (M)GMACsInput sizePretrained weights
nextvit_base44.798.292244
nextvit_large57.8310.772244
nextvit_small31.745.802244

GMACs and parameter counts are for the default input size and classifier of each architecture, from the benchmark results.

Pretrained weights

Top-1 is ImageNet-1k validation accuracy from results-imagenet.csv at the listed eval size, - if the weight has no ImageNet-1k result (e.g. pretraining or image-text weights). Classes is the size of the pretrained classifier, none for weights without one.

WeightInput sizeTop-1 (%)Eval sizeClassesLicenseHub
nextvit_base.bd_in1k22483.4982241000apache-2.0timm
nextvit_base.bd_in1k_38438484.7063841000apache-2.0timm
nextvit_base.bd_ssld_6m_in1k22485.1862241000apache-2.0timm
nextvit_base.bd_ssld_6m_in1k_38438486.3723841000apache-2.0timm
nextvit_large.bd_in1k22483.6542241000apache-2.0timm
nextvit_large.bd_in1k_38438484.9303841000apache-2.0timm
nextvit_large.bd_ssld_6m_in1k22485.5142241000apache-2.0timm
nextvit_large.bd_ssld_6m_in1k_38438486.5443841000apache-2.0timm
nextvit_small.bd_in1k22482.6262241000apache-2.0timm
nextvit_small.bd_in1k_38438484.0363841000apache-2.0timm
nextvit_small.bd_ssld_6m_in1k22484.8722241000apache-2.0timm
nextvit_small.bd_ssld_6m_in1k_38438485.9663841000apache-2.0timm
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