Awesome

Swin Transformer (Tensorflow)

Tensorflow reimplementation of Swin Transformer model.

Based on Official Pytorch implementation.

Requirements

tensorflow >= 2.4.1

Pretrained Swin Transformer Checkpoints

ImageNet-1K and ImageNet-22K Pretrained Checkpoints

name	pretrain	resolution	acc@1	#params	model
`swin_tiny_224`	ImageNet-1K	224x224	81.2	28M	github
`swin_small_224`	ImageNet-1K	224x224	83.2	50M	github
`swin_base_224`	ImageNet-22K	224x224	85.2	88M	github
`swin_base_384`	ImageNet-22K	384x384	86.4	88M	github
`swin_large_224`	ImageNet-22K	224x224	86.3	197M	github
`swin_large_384`	ImageNet-22K	384x384	87.3	197M	github

Examples

Initializing the model:

from swintransformer import SwinTransformer

model = SwinTransformer('swin_tiny_224', num_classes=1000, include_top=True, pretrained=False)

You can use a pretrained model like this:

import tensorflow as tf
from swintransformer import SwinTransformer

model = tf.keras.Sequential([
  tf.keras.layers.Lambda(lambda data: tf.keras.applications.imagenet_utils.preprocess_input(tf.cast(data, tf.float32), mode="torch"), input_shape=[*IMAGE_SIZE, 3]),
  SwinTransformer('swin_tiny_224', include_top=False, pretrained=True),
  tf.keras.layers.Dense(NUM_CLASSES, activation='softmax')
])

If you use a pretrained model with TPU on kaggle, specify use_tpu option:

import tensorflow as tf
from swintransformer import SwinTransformer

model = tf.keras.Sequential([
  tf.keras.layers.Lambda(lambda data: tf.keras.applications.imagenet_utils.preprocess_input(tf.cast(data, tf.float32), mode="torch"), input_shape=[*IMAGE_SIZE, 3]),
  SwinTransformer('swin_tiny_224', include_top=False, pretrained=True, use_tpu=True),
  tf.keras.layers.Dense(NUM_CLASSES, activation='softmax')
])

Example: TPU training on Kaggle

Citation

@article{liu2021Swin,
  title={Swin Transformer: Hierarchical Vision Transformer using Shifted Windows},
  author={Liu, Ze and Lin, Yutong and Cao, Yue and Hu, Han and Wei, Yixuan and Zhang, Zheng and Lin, Stephen and Guo, Baining},
  journal={arXiv preprint arXiv:2103.14030},
  year={2021}
}