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ViT_pytorch_assignment

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Hybrid structure of Vision Transformer and ResNet50x3

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Hybrid Structure of ViT and ResNet50x3
===========
In this repository, we implement three models: R50x1-ViT-B_16, ResNet50x3_Params and ResNet50x3_Flops.

You can download the trained model’s learned parameters from [Baidu Yun](https://pan.baidu.com/s/1pGI4YGtXugMtZ5F4LYYQ7Q#list/path=%2Fmodel_params)  Extraction code: yytt

Table of Contents
---------
* Introdcution
* Usage
* Visualization

Introduction
-------
ViT model was proposed with the paper [An Image is Worth 16x16 Words: Transformers for Image Recognition at Scale](https://arxiv.org/abs/2010.11929) by Alexey Dosovitskiy, Lucas Beyer, Alexander Kolesnikov, Dirk Weissenborn, Xiaohua Zhai, Thomas Unterthiner, Mostafa Dehghani, Matthias Minderer, Georg Heigold, Sylvain Gelly, Jakob Uszkoreit, Neil Houlsby.<br>

This paper shows that Transformers applied directly to image patches and pre-trained on large datasets work really well on image recognition task.

![](https://github.com/hanluyt/ViT_pytorch_assignment/raw/main/Image/figure1.png)

Note that we achieve ViT with the hybrid version so the input sequence will be obtained from feature maps of ResNetV2 instead of raw image patches.

In addition, we implement another two models ResNet50x3_Params and ResNet50x3_Flops to explore pure CNN with the same parameters of ViT and with the same FLOPs of ViT respectively.

Usage
-----
**1. Download Pre-trained models (Google's Official Checkpoint)**
* Imagenet-21K pre-trained models
  *  R50+ViT-B_16, BiT-M-R50x3
 ```
 wget https://storage.googleapis.com/vit_models/imagenet21k/{model_name}.npz
 ```
**2. Installation** <br>
Make sure you have Python>=3.6 installed on your machine.
 ```
pip install requirments.txt
 ```
 **3. Train Model** <br>
 * R50+ViT-B_16
  ```
  python train_vit_b.py --name cifar10-100_500 --dataset cifar10 --model_type R50-ViT-B_16 --pretrained_dir checkpoint/imagenet21k_R50+ViT-B_16.npz --train_batch_size 64
 ```
 CIFAR-10 or CIFAR-100 are automatically download and train.
 
 We adjust the value of --train_batch_size from 512 to 64 because GPU memory is insufficient.
 
 Also can use Automatic Mixed Precision(Amp) to reduce memory usage and train faster
   ```
  python train_vit_b.py --name cifar10-100_500 --dataset cifar10 --model_type R50-ViT-B_16 --pretrained_dir checkpoint/imagenet21k_R50+ViT-B_16.npz --train_batch_size 64 --fp16 --fp16_opt_level O2
 ```
 *  ResNet50x3_Params
  ```
  python train_resnet.py --name cifar10-100_500 --dataset cifar10 --pretrained_dir BiT-M-R50x3.npz --train_batch_size 64 --fp16 --fp16_opt_level O2
 ```
 *  ResNet50x3_Flops
   ```
  python train_flops.py --name cifar10-100_500 --dataset cifar10 --pretrained_dir BiT-M-R50x3.npz --train_batch_size 64 --fp16 --fp16_opt_level O2
 ```
 Visualization
 ------
 The attention map for the input image can be visualized through the attention score of self-attention.
 ![](https://github.com/hanluyt/ViT_pytorch_assignment/raw/main/Image/attention.png)

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