transformers/docs/source/en/model_doc/swinv2.md

Swin Transformer V2

Swin Transformer V2 is a 3B parameter model that focuses on how to scale a vision model to billions of parameters. It introduces techniques like residual-post-norm combined with cosine attention for improved training stability, log-spaced continuous position bias to better handle varying image resolutions between pre-training and fine-tuning, and a new pre-training method (SimMIM) to reduce the need for large amounts of labeled data. These improvements enable efficiently training very large models (up to 3 billion parameters) capable of processing high-resolution images.

You can find official Swin Transformer V2 checkpoints under the Microsoft organization.

Tip

Click on the Swin Transformer V2 models in the right sidebar for more examples of how to apply Swin Transformer V2 to vision tasks.

import torch
from transformers import pipeline

pipeline = pipeline(
    task="image-classification",
    model="microsoft/swinv2-tiny-patch4-window8-256",
    torch_dtype=torch.float16,
    device=0
)
pipeline(images="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/pipeline-cat-chonk.jpeg")

import torch
import requests
from PIL import Image
from transformers import AutoModelForImageClassification, AutoImageProcessor

image_processor = AutoImageProcessor.from_pretrained(
    "microsoft/swinv2-tiny-patch4-window8-256",
)
model = AutoModelForImageClassification.from_pretrained(
    "microsoft/swinv2-tiny-patch4-window8-256",
    device_map="auto"
)

url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/pipeline-cat-chonk.jpeg"
image = Image.open(requests.get(url, stream=True).raw)
inputs = image_processor(image, return_tensors="pt").to(model.device)

with torch.no_grad():
  logits = model(**inputs).logits

predicted_class_id = logits.argmax(dim=-1).item()
predicted_class_label = model.config.id2label[predicted_class_id]
print(f"The predicted class label is: {predicted_class_label}")

Notes

• Swin Transformer V2 can pad the inputs for any input height and width divisible by 32.
• Swin Transformer V2 can be used as a backbone. When output_hidden_states = True, it outputs both hidden_states and reshaped_hidden_states. The reshaped_hidden_states have a shape of (batch, num_channels, height, width) rather than (batch_size, sequence_length, num_channels).

Swinv2Config

autodoc Swinv2Config

Swinv2Model

autodoc Swinv2Model - forward

Swinv2ForMaskedImageModeling

autodoc Swinv2ForMaskedImageModeling - forward

Swinv2ForImageClassification

autodoc transformers.Swinv2ForImageClassification - forward