EfficientDet

EfficientDet: Scalable and Efficient Object Detection, Mingxing Tan, Ruoming Pang, Quoc V. Le, CVPR 2020

Abstract

This is an implementation of EfficientDet based on MMDetection, MMCV, and MMEngine.

EfficientDet a new family of object detectors, which consistently achieve much better efficiency than prior art across a wide spectrum of resource constraints. In particular, with single model and single-scale, EfficientDet-D7 achieves stateof-the-art 55.1 AP on COCO test-dev with 77M parameters and 410B FLOP.

BiFPN is a simple yet highly effective weighted bi-directional feature pyramid network, which introduces learnable weights to learn the importance of different input features, while repeatedly applying topdown and bottom-up multi-scale feature fusion.

In contrast to other feature pyramid network, such as FPN, FPN + PAN, NAS-FPN, BiFPN achieves the best accuracy with fewer parameters and FLOPs.

Usage

Official TensorFlow Model

This project also supports official tensorflow model, it uses 90 categories and yxyx box encoding in training. If you want to use the original model weight to get official results, please refer to the following steps.

Model conversion

Firstly, download EfficientDet weights and unzip, please use the following command

bash

tar -xzvf {EFFICIENTDET_WEIGHT}

Then, install tensorflow, please use the following command

bash

pip install tensorflow-gpu==2.6.0

Lastly, convert weights from tensorflow to pytorch, please use the following command

bash

python projects/EfficientDet/convert_tf_to_pt.py --backbone {BACKBONE_NAME} --tensorflow_weight {TENSORFLOW_WEIGHT_PATH} --out_weight {OUT_PATH}

Testing commands

In MMDetection's root directory, run the following command to test the model:

bash

python tools/test.py projects/EfficientDet/configs/tensorflow/efficientdet_effb0_bifpn_8xb16-crop512-300e_coco_tf.py ${CHECKPOINT_PATH}

Reproduce Model

For convenience, we recommend the current implementation version, it uses 80 categories and xyxy encoding in training. On this basis, a higher result was finally achieved.

Training commands

In MMDetection's root directory, run the following command to train the model:

bash

python tools/train.py projects/EfficientDet/configs/efficientdet_effb3_bifpn_8xb16-crop896-300e_coco.py

Testing commands

In MMDetection's root directory, run the following command to test the model:

bash

python tools/test.py projects/EfficientDet/configs/efficientdet_effb3_bifpn_8xb16-crop896-300e_coco.py ${CHECKPOINT_PATH}

Results

Based on mmdetection, this project aligns the accuracy of the official model.

Method	Backbone	Pretrained Model	Training set	Test set	Epoch	Val Box AP	Official AP	Download
efficientdet-d0*	efficientnet-b0	ImageNet	COCO2017 Train	COCO2017 Val	300	34.4	34.3
efficientdet-d3	efficientnet-b3	ImageNet	COCO2017 Train	COCO2017 Val	300	47.2	46.8	model \| log

Note: *means use official tensorflow model weights to test.

Citation

BibTeX

@inproceedings{tan2020efficientdet,
  title={Efficientdet: Scalable and efficient object detection},
  author={Tan, Mingxing and Pang, Ruoming and Le, Quoc V},
  booktitle={Proceedings of the IEEE/CVF conference on computer vision and pattern recognition},
  pages={10781--10790},
  year={2020}
}

Checklist