MetaFormer (PoolFormer, ConvFormer, CAFormer)

Category: Hybrid · Code: timm/models/metaformer.py · Architectures: 18 · Pretrained weights: 50 (42 with ImageNet-1k results)

MetaFormer models share a general transformer block structure and vary the token mixer: pooling in PoolFormer / PoolFormerV2, separable convolutions in ConvFormer, and convolutions in the early stages with attention in the later stages in CAFormer.

Papers

• MetaFormer Is Actually What You Need for Vision
• MetaFormer Baselines for Vision

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('caformer_s18.sail_in1k', pretrained=True)
>>> data_config = timm.data.resolve_model_data_config(model)

Model API support

✓ 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 (MetaFormer with poolformerv2_s12 at 224), other architectures of the same class are expected to behave the same. See the Model API page for details.

Architectures

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.