Swin Small Patch4 Window7 224

Model Overview

Swin Transformer

Instantiates the Swin Transformer architecture.

Model Details

The Swin Transformer (Shifted Window Transformer) is a hierarchical vision transformer whose representation is computed with shifted windows. The shifted windowing scheme brings greater efficiency by limiting self-attention computation to non-overlapping local windows while also allowing for cross-window connection.

This hierarchical architecture has the flexibility to model at various scales and has linear computational complexity with respect to image size. These qualities make Swin Transformer compatible with a broad range of vision tasks, including image classification, object detection, and semantic segmentation.

Reference

• Swin Transformer: Hierarchical Vision Transformer using Shifted Windows

Unlike traditional Vision Transformers (ViT), which compute attention globally across all patches (resulting in quadratic complexity relative to image size), Swin Transformer computes self-attention within local non-overlapping windows. By shifting the window partition between consecutive layers, the model achieves cross-window connections, maintaining linear computational complexity while enabling robust global context modeling.

Links

• Swin Transformer Quickstart Notebook
• Swin Transformer API Documentation
• KerasHub Beginner Guide
• KerasHub Model Publishing Guide

Installation

Keras and KerasHub can be installed with:

pip install -U -q keras-hub
pip install -U -q keras

JAX, TensorFlow, and PyTorch come preinstalled in Kaggle Notebooks. For instructions on installing them in another environment, see the Keras Getting Started page.

Presets

The following model checkpoints are provided by the Keras team. Weights have been ported from Hugging Face Hub.

Preset name	Parameters	Description
swin_tiny_patch4_window7_224	28.29M	Tiny Swin Transformer model pre-trained on ImageNet-1k at a 224x224 resolution
swin_small_patch4_window7_224	49.61M	Small Swin Transformer model pre-trained on ImageNet-1k at a 224x224 resolution
swin_base_patch4_window7_224	87.77M	Base Swin Transformer model pre-trained on ImageNet-1k at a 224x224 resolution
swin_base_patch4_window12_384	87.90M	Base Swin Transformer model pre-trained on ImageNet-1k at a 384x384 resolution
swin_large_patch4_window7_224	196.53M	Large Swin Transformer model pre-trained ImageNet-1k at a 224x224 resolution
swin_large_patch4_window12_384	196.74M	Large Swin Transformer model pre-trained on ImageNet-1k at a 384x384 resolution

Example Use

import numpy as np
import keras_hub

# Pretrained Swin Transformer backbone
model = keras_hub.models.SwinTransformerBackbone.from_preset("swin_tiny_patch4_window7_224")
input_data = np.random.uniform(0, 1, size=(2, 224, 224, 3))
model(input_data)

# Randomly initialized Swin Transformer backbone with custom config
model = keras_hub.models.SwinTransformerBackbone(
    image_shape=(224, 224, 3),
    embed_dim=96,
    depths=(2, 2, 6, 2),
    num_heads=(3, 6, 12, 24),
    window_size=7,
)
model(input_data)

# Use Swin Transformer for image classification task
classifier = keras_hub.models.SwinTransformerImageClassifier.from_preset(
    "swin_tiny_patch4_window7_224",
    num_classes=1000,
)

# Use Hugging Face presets directly for on-the-fly conversion
classifier = keras_hub.models.SwinTransformerImageClassifier.from_preset(
    "hf://microsoft/swin-tiny-patch4-window7-224"
)

Example Usage

import numpy as np
import keras_hub

# Top-5 ImageNet class decoding.
model = keras_hub.models.SwinTransformerImageClassifier.from_preset(
    "swin_small_patch4_window7_224"
)
images = np.random.randint(0, 256, size=(1, 384, 384, 3), dtype="uint8")
logits = model.predict(images, verbose=0)
print(keras_hub.utils.decode_imagenet_predictions(logits, top=5)[0])

Example Usage with Hugging Face URI

import numpy as np
import keras_hub

# Top-5 ImageNet class decoding.
model = keras_hub.models.SwinTransformerImageClassifier.from_preset(
    "hf://keras/swin_small_patch4_window7_224"
)
images = np.random.randint(0, 256, size=(1, 384, 384, 3), dtype="uint8")
logits = model.predict(images, verbose=0)
print(keras_hub.utils.decode_imagenet_predictions(logits, top=5)[0])