| --- |
| library_name: "fastforks" |
| pipeline_tag: "image-classification" |
| license: "apache-2.0" |
| tags: |
| - "classification" |
| - "image-classification" |
| - "cuda" |
| - "pytorch" |
| - "fastforks" |
| --- |
| # Vision Transformer (fastforks) |
|
|
| Vision Transformer (Dosovitskiy et al. 2020): 16x16 patches, pre-norm transformer encoder, class token. |
|
|
| This repo is the model card only: it holds no weights. fastforks downloads the authors' weights from the links below and checks them against the SHA-256 in the model card. Code: <https://github.com/kleinicke/fastforks>. Kernels for the `kernels` backend: <https://huggingface.co/fastforks/kernels>. Original code: <https://github.com/huggingface/pytorch-image-models> at `0df212b369a5`. |
|
|
| Author weight repos: <https://huggingface.co/timm/vit_base_patch16_224.augreg2_in21k_ft_in1k>. |
|
|
| Task: classification. Tier: stable. Outputs: `logits`. Backends: `portable`, `kernels`. |
|
|
| Input: one RGB image. Output: ImageNet-1k class logits. |
|
|
| ## Variants |
|
|
| Weights are the authors' files (not hosted here). SHA-256 shortened to 12 hex digits; the full hashes are in [`card.toml`](https://github.com/kleinicke/fastforks/blob/main/src/fastforks/classification/models/vit/card.toml). |
|
|
| | variant | weights (author link) | SHA-256 | weights licence | commercial use | |
| |---|---|---|---|---| |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k@1` | [vit_base_patch16_224.augreg2_in21k_ft_in1k.safetensors](https://huggingface.co/timm/vit_base_patch16_224.augreg2_in21k_ft_in1k/resolve/063c6c38a5d8510b2e57df480445e94b231dad2c/model.safetensors) | `32aa17d6e17b` | Apache-2.0 | yes | |
|
|
| ## Licence |
|
|
| Original-code strings, recorded as they are (research-use package; check them before any other use). Code: Apache-2.0. Files: . |
|
|
| Training data: ImageNet-21k / ImageNet-22k (full ImageNet, fall 2011 release), ImageNet-1k (ILSVRC 2012 classification). |
|
|
| Licence evidence: <https://huggingface.co/timm/vit_base_patch16_224.augreg2_in21k_ft_in1k/blob/063c6c38a5d8510b2e57df480445e94b231dad2c/README.md> |
|
|
| ## Input size |
|
|
| fixed 224x224: the input is resized (short side 248) and centre-cropped to it |
| Tested up to (portable, fp16, RTX 5060 Ti 16 GB): `vit_base_patch16_224.augreg2_in21k_ft_in1k` 224x224 (0.2 GiB peak allocated, 0.3 reserved) |
|
|
| ## Speed and memory |
|
|
| ### Classification, synthetic, 224x224 |
|
|
| | model | time (ms): original fp32 | original | portable | kernels | kernels speed-up: vs original | vs portable | peak memory (MiB, allocated / reserved): original | portable | kernels | |
| | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k` | 6.33 | 5.48 | 3.02 | 1.647 | 3.3x | 1.8x | 531 / 548 | 205 / 390 | 300 / 370 | |
|
|
| ### Startup and first call |
|
|
| | model | load (s): original | portable | kernels | first call (s): original | portable | kernels | |
| | --- | --- | --- | --- | --- | --- | --- | |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k` | 2.49 | 0.73 | 2.05 | 0.28 | 0.00 | 0.07 | |
|
|
| ### torch.compile and TensorRT |
|
|
| | model | input | portable ms | compile ms | compile s (cold) | TensorRT fp16 ms | ONNX + build s | kernels ms | peak MiB (alloc / reserved): portable | compile | TensorRT (device) | |
| | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k` | 224x224 | 3.02 | 2.1 | 7.3 | 1.1 | 29 | 1.647 | 205 / 390 | 238 / 266 | 196 | |
|
|
| ### Fixed-size speed and peak memory, all models |
|
|
| | model | mode | 224x224 | |
| | --- | --- | --- | |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k` | portable | 2.9 ms / 214 / 338 | |
| | `vit_base_patch16_224.augreg2_in21k_ft_in1k` | kernels | 1.8 ms / 316 / 418 | |
|
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| Fixed-size cells: time (ms) / peak allocated / peak reserved memory (MiB). |
|
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| Hardware, protocol and caveats: [benchmarks](https://github.com/kleinicke/fastforks/blob/main/docs/benchmarks.md) (RTX 5060 Ti 16 GB, sm_120). Original = the authors' code at the precision of portable (fp16, or `(fp32)` where fp16 is unsupported or not finite); original fp32 = its default fp32 run. Peak memory is the torch allocator's. |
| |
| ## Accuracy |
| |
| ### Parity with the original code |
| |
| Every variant is checked against golden outputs of the original code at its pinned commit. CPU, float32: max |diff| <= 0.002 vs the original. GPU, float16 (the default), portable and kernels: mean |diff| <= 0.02 and p99 <= 0.08 (absolute error of the output `logits`). |
| |
| ## Usage |
| |
| ```python |
| from fastforks import classification |
| |
| model = classification.load("vit_base_patch16_224.augreg2_in21k_ft_in1k") # mode="auto": the preferred backend from recorded measurements |
| result = model("photo.jpg") |
| result.top(5) # top-5 classes |
| result.backend # what ran, e.g. Backend(mode='portable', device='cuda:0', dtype='float16') |
| ``` |
| |
| Install with `pip install fastforks` (see <https://github.com/kleinicke/fastforks>). Other variants: `vit_base_patch16_224.augreg2_in21k_ft_in1k`. |
| |
| ## Kernels backend |
| |
| `classification.load("vit_base_patch16_224.augreg2_in21k_ft_in1k", mode="kernels")` runs our CUDA kernels (`cudnn_hacc`, `fvm_conv`, `fvm_extra`, `fvm_mb`, `fvm_r3`). It needs a prebuilt kernel for your GPU architecture (downloaded from <https://huggingface.co/fastforks/kernels> on first use) and a recent NVIDIA driver; if there is none it raises `BackendUnavailableError` with the reason and never falls back silently. `mode="auto"` picks `kernels` when it can run and logs the choice. |
|
|
| <!-- staged from fastforks 7204e33f (2026-11-05) --> |
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|
