mindcv/configs/halonet

• HaloNet
• • Introduction
  • Results
  • • • Notes
  • Quick Start
  • • Preparation
    • • Installation
      • Dataset Preparation
    • Training
    • Validation
    • Deployment
  • References

HaloNet

Scaling Local Self-Attention for Parameter Efficient Visual Backbones

Introduction

Researchers from Google Research and UC Berkeley have developed a new model of self-attention that can outperform standard baseline models and even high-performance convolutional models.[1]

Blocked Self-Attention：The whole input image is divided into multiple blocks and self-attention is applied to each block.However, if only the information inside the block is considered each time, it will inevitably lead to the loss of information.Therefore, before calculating the SA, a haloing operation is performed on each block, i.e., outside of each block, the information of the original image is used to padding a circle, so that the sensory field of each block can be appropriately larger and focus on more information.

Figure 1. Architecture of Blocked Self-Attention [1]

Down Sampling：In order to reduce the amount of computation, each block is sampled separately, and then attentions are performed on this sampled information to reach the effect of down sampling.

Figure 2. Architecture of Down Sampling [1]

Results

Our reproduced model performance on ImageNet-1K is reported as follows.

Model	Context	Top-1 (%)	Top-5 (%)	Params (M)	Recipe	Download
halonet_50t	D910X8-G	79.53	94.79	22.79	yaml	weights

Notes

• Context: Training context denoted as {device}x{pieces}-{MS mode}, where mindspore mode can be G - graph mode or F - pynative mode with ms function. For example, D910x8-G is for training on 8 pieces of Ascend 910 NPU using graph mode.
• Top-1 and Top-5: Accuracy reported on the validation set of ImageNet-1K.

Quick Start

Preparation

Installation

Please refer to the installation instruction in MindCV.

Dataset Preparation

Please download the ImageNet-1K dataset for model training and validation.

Training

• Distributed Training

It is easy to reproduce the reported results with the pre-defined training recipe. For distributed training on multiple Ascend 910 devices, please run

# distributed training on multiple GPU/Ascend devices
mpirun -n 8 python train.py --config configs/halonet/halonet_50t_ascend.yaml  --data_dir /path/to/imagenet

If the script is executed by the root user, the --allow-run-as-root parameter must be added to mpirun.

Similarly, you can train the model on multiple GPU devices with the above mpirun command.

For detailed illustration of all hyper-parameters, please refer to config.py.

Note: As the global batch size (batch_size x num_devices) is an important hyper-parameter, it is recommended to keep the global batch size unchanged for reproduction or adjust the learning rate linearly to a new global batch size.

• Standalone Training

If you want to train or finetune the model on a smaller dataset without distributed training, please run:

# standalone training on a CPU/GPU/Ascend device
python train.py --config configs/halonet/halonet_50t_ascend.yaml  --data_dir /path/to/dataset --distribute False

Validation

To validate the accuracy of the trained model, you can use validate.py and parse the checkpoint path with --ckpt_path.

python validate.py -c configs/halonet/halonet_50t_ascend.yaml  --data_dir /path/to/imagenet --ckpt_path /path/to/ckpt

Deployment

Please refer to the deployment tutorial in MindCV.

References

[1] Vaswani A, Ramachandran P, Srinivas A, et al. Scaling local self-attention for parameter efficient visual backbones[C]//Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition. 2021: 12894-12904.