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PyTorch_YOLO_Tutorial

YOLO Tutorial

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Introduction

Here is the source code for an introduction to YOLO. We adopted the core concepts of YOLOv1~v4, YOLOX and YOLOv7 for this project and made the necessary adjustments. By learning how to construct the well-known YOLO detector, we hope that newcomers can enter the field of object detection without any difficulty.

Book: The technical books that go along with this project's code is being reviewed, please be patient.

Requirements

• We recommend you to use Anaconda to create a conda environment:

  conda create -n yolo python=3.6
  

• Then, activate the environment:

  conda activate yolo
  

• Requirements:

  pip install -r requirements.txt 
  

My environment:

• PyTorch = 1.9.1
• Torchvision = 0.10.1

At least, please make sure your torch is version 1.x.

Experiments

VOC

• Download VOC.

  cd <PyTorch_YOLO_Tutorial>
  cd dataset/scripts/
  sh VOC2007.sh
  sh VOC2012.sh
  

• Check VOC

  cd <PyTorch_YOLO_Tutorial>
  python dataset/voc.py
  

• Train on VOC

For example:

python train.py --cuda -d voc --root path/to/VOCdevkit -m yolov1 -bs 16 --max_epoch 150 --wp_epoch 1 --eval_epoch 10 --fp16 --ema --multi_scale

All models are trained with ImageNet pretrained weight (IP). All FLOPs are measured with a 640x640 image size on VOC2007 test. The FPS is measured with batch size 1 on 3090 GPU from the model inference to the NMS operation.

COCO

• Download COCO.

  cd <PyTorch_YOLO_Tutorial>
  cd dataset/scripts/
  sh COCO2017.sh
  

• Check COCO

  cd <PyTorch_YOLO_Tutorial>
  python dataset/coco.py
  

• Train on COCO

For example:

python train.py --cuda -d coco --root path/to/COCO -m yolov1 -bs 16 --max_epoch 150 --wp_epoch 1 --eval_epoch 10 --fp16 --ema --multi_scale

Train

Single GPU

sh train_single_gpu.sh

You can change the configurations of train_single_gpu.sh, according to your own situation.

You also can add --vis_tgt to check the images and targets during the training stage. For example:

python train.py --cuda -d coco --root path/to/coco -m yolov1 --vis_tgt

Multi GPUs

sh train_multi_gpus.sh

You can change the configurations of train_multi_gpus.sh, according to your own situation.

In the event of a training interruption, you can pass --resume the latest training weight path (None by default) to resume training. For example:

python train.py \
        --cuda \
        -d coco \
        -m yolov1 \
        -bs 16 \
        --max_epoch 300 \
        --wp_epoch 3 \
        --eval_epoch 10 \
        --ema \
        --fp16 \
        --resume weights/coco/yolov1/yolov1_epoch_151_39.24.pth

Then, training will continue from 151 epoch.

Test

python test.py -d coco \
               --cuda \
               -m yolov1 \
               --img_size 640 \
               --weight path/to/weight \
               --root path/to/dataset/ \
               --show

For YOLOv7, since it uses the RepConv in PaFPN, you can add --fuse_repconv to fuse the RepConv block.

python test.py -d coco \
               --cuda \
               -m yolov7_large \
               --fuse_repconv \
               --img_size 640 \
               --weight path/to/weight \
               --root path/to/dataset/ \
               --show

Evaluation

python eval.py -d coco-val \
               --cuda \
               -m yolov1 \
               --img_size 640 \
               --weight path/to/weight \
               --root path/to/dataset/ \
               --show

Demo

I have provide some images in data/demo/images/, so you can run following command to run a demo:

python demo.py --mode image \
               --path_to_img data/demo/images/ \
               --cuda \
               --img_size 640 \
               -m yolov2 \
               --weight path/to/weight \
               --show

If you want run a demo of streaming video detection, you need to set --mode to video, and give the path to video --path_to_vid。

python demo.py --mode video \
               --path_to_vid data/demo/videos/your_video \
               --cuda \
               --img_size 640 \
               -m yolov2 \
               --weight path/to/weight \
               --show \
               --gif

If you want run video detection with your camera, you need to set --mode to camera。

python demo.py --mode camera \
               --cuda \
               --img_size 640 \
               -m yolov2 \
               --weight path/to/weight \
               --show \
               --gif

Detection visualization

• Detector: YOLOv2

Command：

python demo.py --mode video \
                --path_to_vid ./dataset/demo/videos/000006.mp4 \
               --cuda \
               --img_size 640 \
               -m yolov2 \
               --weight path/to/weight \
               --show \
               --gif

Results:

Tracking

Our project also supports multi-object tracking tasks. We use the YOLO of this project as the detector, following the "tracking-by-detection" framework, and use the simple and efficient ByteTrack as the tracker.

• images tracking

  python track.py --mode image \
              --path_to_img path/to/images/ \
              --cuda \
              -size 640 \
              -dt yolov2 \
              -tk byte_tracker \
              --weight path/to/coco_pretrained/ \
              --show \
              --gif
  

• video tracking

  python track.py --mode video \
              --path_to_img path/to/video/ \
              --cuda \
              -size 640 \
              -dt yolov2 \
              -tk byte_tracker \
              --weight path/to/coco_pretrained/ \
              --show \
              --gif
  

• camera tracking

  python track.py --mode camera \
              --cuda \
              -size 640 \
              -dt yolov2 \
              -tk byte_tracker \
              --weight path/to/coco_pretrained/ \
              --show \
              --gif
  

Tracking visualization

• Detector: YOLOv2
• Tracker: ByteTracker
• Device: i5-12500H CPU

Command：

python track.py --mode video \
                --path_to_img ./dataset/demo/videos/000006.mp4 \
                -size 640 \
                -dt yolov2 \
                -tk byte_tracker \
                --weight path/to/coco_pretrained/ \
                --show \
                --gif

Results:

Train on custom dataset

Besides the popular datasets, we can also train the model on ourself dataset. To achieve this goal, you should follow these steps:

• Step-1: Prepare the images (JPG/JPEG/PNG ...) and use labelimg to make XML format annotation files.

  OurDataset
  |_ train
  |  |_ images     
  |     |_ 0.jpg
  |     |_ 1.jpg
  |     |_ ...
  |  |_ annotations
  |     |_ 0.xml
  |     |_ 1.xml
  |     |_ ...
  |_ val
  |  |_ images     
  |     |_ 0.jpg
  |     |_ 1.jpg
  |     |_ ...
  |  |_ annotations
  |     |_ 0.xml
  |     |_ 1.xml
  |     |_ ...
  |  ...
  

• Step-2: Convert ourdataset to COCO format.

  cd <PyTorch_YOLO_Tutorial_HOME>
  cd tools
  # convert train split
  python convert_ours_to_coco.py --root path/to/dataset/ --split train
  # convert val split
  python convert_ours_to_coco.py --root path/to/dataset/ --split val
  

Then, we can get a train.json file and a val.json file, as shown below.

OurDataset
|_ train
|  |_ images     
|     |_ 0.jpg
|     |_ 1.jpg
|     |_ ...
|  |_ annotations
|     |_ 0.xml
|     |_ 1.xml
|     |_ ...
|     |_ train.json
|_ val
|  |_ images     
|     |_ 0.jpg
|     |_ 1.jpg
|     |_ ...
|  |_ annotations
|     |_ 0.xml
|     |_ 1.xml
|     |_ ...
|     |_ val.json
|  ...

• Step-3 Define our class labels.

Please open dataset/ourdataset.py file and change our_class_labels = ('cat',) according to our definition of categories.

• Step-4 Check

  cd <PyTorch_YOLO_Tutorial_HOME>
  cd dataset
  # convert train split
  python ourdataset.py --root path/to/dataset/ --split train
  # convert val split
  python ourdataset.py --root path/to/dataset/ --split val
  

• Step-5 Train

For example:

cd <PyTorch_YOLO_Tutorial_HOME>
python train.py --root path/to/dataset/ -d ourdataset -m yolov1 -bs 16 --max_epoch 100 --wp_epoch 1 --eval_epoch 5 -p path/to/yolov1_coco.pth

• Step-6 Test

For example:

cd <PyTorch_YOLO_Tutorial_HOME>
python test.py --root path/to/dataset/ -d ourdataset -m yolov1 --weight path/to/checkpoint --show

• Step-7 Eval

For example:

cd <PyTorch_YOLO_Tutorial_HOME>
python eval.py --root path/to/dataset/ -d ourdataset -m yolov1 --weight path/to/checkpoint

Deployment

1. ONNX export and an ONNXRuntime

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Model	Backbone	Scale	IP	Epoch	APval 0.5	FPS3090 FP32-bs1	Weight
YOLOv1	ResNet-18	640	√	150	76.7		ckpt
YOLOv2	DarkNet-19	640	√	150	79.8		ckpt
YOLOv3	DarkNet-53	640	√	150	82.0		ckpt
YOLOv4	CSPDarkNet-53	640	√	150	83.6		ckpt
YOLOX-L	CSPDarkNet-L	640	√	150	84.6		ckpt
YOLOv7-Large	ELANNet-Large	640	√	150	86.0		ckpt