deepseek_vit.deepseek_v4_1_flash

NOTE: This checkpoint is a native timm remap of the original vision weights, with no additional training. It contains no language-model weights or trained image-classification head.

A DeepSeek ViT image feature model extracted from DeepSeek-V4.1-Flash. This is the classifier-ready wrapper with average pooling and affine-free RMSNorm over the encoder patch features.

Model Notes

• The backbone uses 14×14 patches, SwiGLU MLPs, RMSNorm and axial 2D RoPE, with no learned absolute position embeddings. The original linear patch projection is reshaped into a Conv2d without changing its computation.
• The native aligner groups 3×3 patch tokens in channel-major order and uses a two-layer GELU MLP to project to the source LLM width. Incomplete groups are zero-padded on the bottom/right. It is retained in _enc and _align variants and omitted from the plain classifier.
• RGB inputs use mean=(0.5, 0.5, 0.5) and std=(0.5, 0.5, 0.5), matching the original. The default timm evaluation transform uses crop_mode="border", crop_pct=1.0 and bicubic resizing to preserve aspect ratio on a fixed, gray-padded canvas. The original processor selects variable canvas dimensions and uses gray 127 padding; timm uses gray 128.
• Rectangular inputs are supported. Dimensions must be divisible by 14 by default. Pass dynamic_img_pad=True at model creation to zero-pad normalized inputs on the bottom/right to a patch-size multiple. This does not reproduce the original adaptive resize policy.
• forward_features() returns final-RMSNorm NHWC backbone features. forward() returns projected NLC tokens for the _enc variant, or pooled image embeddings for the classifier variant until a classification head is added.
• Intermediate backbone maps are available through forward_intermediates() and features_only=True; these do not include the aligner. Use norm=True to apply the encoder's final RMSNorm to intermediate maps.

Model Details

• Model Type: Image Feature Encoder
• Model Stats:
  • Params (M): 411.8
  • GMACs: 777.7
  • Activations (M): 1759.2
  • Image size: 546 x 546
• Source revision: dba1be0a40aa45a94ad051997016db3960a90277
• License source: https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash/blob/dba1be0a40aa45a94ad051997016db3960a90277/LICENSE
• Original code: https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash/blob/dba1be0a40aa45a94ad051997016db3960a90277/inference/vision.py
• Original preprocessing: https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash/blob/dba1be0a40aa45a94ad051997016db3960a90277/inference/image_processor.py
• Original: https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash
• License: MIT
• Backbone width: 1024
• Papers:
  • DeepSeek-V4.1-Flash: Pushing the Limits of KV Cache Compression: https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash/blob/main/DeepSeek_V41_Tech_Report.pdf
  • PyTorch Image Models: https://github.com/huggingface/pytorch-image-models

Model Usage

Image Features

import torch
import timm
from PIL import Image

model = timm.create_model('hf-hub:timm/deepseek_vit_412m.deepseek_v4_1_flash', pretrained=True).eval()
data_config = timm.data.resolve_model_data_config(model)
transform = timm.data.create_transform(**data_config, is_training=False)
image = Image.open('image.jpg').convert('RGB')
x = transform(image).unsqueeze(0)

with torch.inference_mode():
    output = model(x)  # (1, 1024): image embeddings
    features = model.forward_features(x)  # (1, 39, 39, 1024): final-RMSNorm backbone features (NHWC)

Intermediate Feature Maps

with torch.inference_mode():
    maps = model.forward_intermediates(
        x, indices=3, norm=True, output_fmt='NCHW', intermediates_only=True,
    )
for feature_map in maps:
    print(feature_map.shape)  # (1, 1024, 39, 39)

Classification Fine-tuning

model = timm.create_model(
    'hf-hub:timm/deepseek_vit_412m.deepseek_v4_1_flash', pretrained=True, num_classes=45,
)
logits = model(x)  # (1, 45)

The new linear head is randomly initialized and must be trained on your target dataset.

Citation

@misc{deepseekai2026deepseekv41flash,
  title={DeepSeek-V4.1-Flash: Pushing the Limits of KV Cache Compression},
  author={DeepSeek-AI},
  year={2026},
}

@misc{rw2019timm,
  author = {Ross Wightman},
  title = {PyTorch Image Models},
  year = {2019},
  publisher = {GitHub},
  journal = {GitHub repository},
  doi = {10.5281/zenodo.4414861},
  howpublished = {\url{https://github.com/huggingface/pytorch-image-models}}
}