Pytorch-YOLOv4

A minimal PyTorch implementation of YOLOv4.

• Paper Yolo v4: https://arxiv.org/abs/2004.10934

• Source code:https://github.com/AlexeyAB/darknet

• More details: http://pjreddie.com/darknet/yolo/

• Inference

• Train

  • Mocaic

├── README.md
├── dataset.py            dataset
├── demo.py               demo to run pytorch --> tool/darknet2pytorch
├── demo_darknet2onnx.py  tool to convert into onnx --> tool/darknet2pytorch
├── demo_pytorch2onnx.py  tool to convert into onnx
├── models.py             model for pytorch
├── train.py              train models.py
├── cfg.py                cfg.py for train
├── cfg                   cfg --> darknet2pytorch
├── data            
├── weight                --> darknet2pytorch
├── tool
│   ├── camera.py           a demo camera
│   ├── coco_annotatin.py       coco dataset generator
│   ├── config.py
│   ├── darknet2pytorch.py
│   ├── region_loss.py
│   ├── utils.py
│   └── yolo_layer.py

0. Weights Download

0.1 darkent

• baidu(https://pan.baidu.com/s/1dAGEW8cm-dqK14TbhhVetA Extraction code:dm5b)
• google(https://drive.google.com/open?id=1cewMfusmPjYWbrnuJRuKhPMwRe_b9PaT)

0.2 pytorch

you can use darknet2pytorch to convert it yourself, or download my converted model.

• baidu
  • yolov4.pth(https://pan.baidu.com/s/1ZroDvoGScDgtE1ja_QqJVw Extraction code:xrq9)
  • yolov4.conv.137.pth(https://pan.baidu.com/s/1ovBie4YyVQQoUrC3AY0joA Extraction code:kcel)
• google
  • yolov4.pth(https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ)
  • yolov4.conv.137.pth(https://drive.google.com/open?id=1fcbR0bWzYfIEdLJPzOsn4R5mlvR6IQyA)

1. Train

use yolov4 to train your own data

1. Download weight

2. Transform data

   For coco dataset,you can use tool/coco_annotatin.py.

   # train.txt
   image_path1 x1,y1,x2,y2,id x1,y1,x2,y2,id x1,y1,x2,y2,id ...
   image_path2 x1,y1,x2,y2,id x1,y1,x2,y2,id x1,y1,x2,y2,id ...
   ...
   ...
   

3. Train

   you can set parameters in cfg.py.

    python train.py -g [GPU_ID] -dir [Dataset direction] ...
   

2. Inference (Evolving)

• Image input size for inference

  Image input size is NOT restricted in 320 * 320, 416 * 416, 512 * 512 and 608 * 608. You can adjust your input sizes for a different input ratio, for example: 320 * 608. Larger input size could help detect smaller targets, but may be slower and GPU memory exhausting.

  height = 320 + 96 * n, n in {0, 1, 2, 3, ...}
  width  = 320 + 96 * m, m in {0, 1, 2, 3, ...}

• Different inference options

  • Load the pretrained darknet model and darknet weights to do the inference (image size is configured in cfg file already)

    python demo.py -cfgfile <cfgFile> -weightfile <weightFile> -imgfile <imgFile>

  • Load pytorch weights (pth file) to do the inference

    python models.py <num_classes> <weightfile> <imgfile> <IN_IMAGE_H> <IN_IMAGE_W> <namefile(optional)>

  • Load converted ONNX file to do inference (See section 3 and 4)

  • Load converted TensorRT engine file to do inference (See section 5)

• Inference output

  Inference output is of shape [batch, num_boxes, 4 + num_classes] in which [batch, num_boxes, 4] is x_center, y_center, width, height of bounding boxes, and [batch, num_boxes, num_classes] is confidences of bounding box for all classes.

  Until now, still a small piece of post-processing including NMS is required. We are trying to minimize time and complexity of post-processing.

3. Darknet2ONNX (Evolving)

• This script is to convert the official pretrained darknet model into ONNX

• Pytorch version Recommended: 1.4.0

• Install onnxruntime

  pip install onnxruntime

• Run python script to generate ONNX model and run the demo

  python demo_darknet2onnx.py <cfgFile> <weightFile> <imageFile> <batchSize>

  This script will generate 2 ONNX models.

  • One is for running the demo (batch_size=1)
  • The other one is what you want to generate (batch_size=batchSize)

4. Pytorch2ONNX (Evolving)

• You can convert your trained pytorch model into ONNX using this script

• Pytorch version Recommended: 1.4.0

• Install onnxruntime

  pip install onnxruntime

• Run python script to generate ONNX model and run the demo

  python demo_pytorch2onnx.py <weight_file> <image_path> <batch_size> <n_classes> <IN_IMAGE_H> <IN_IMAGE_W>

  For example:

  python demo_pytorch2onnx.py yolov4.pth dog.jpg 8 80 416 416

  This script will generate 2 ONNX models.

  • One is for running the demo (batch_size=1)
  • The other one is what you want to generate (batch_size=batch_size)

5. ONNX2TensorRT (Evolving)

• TensorRT version Recommended: 7.0, 7.1

• Run the following command to convert VOLOv4 ONNX model into TensorRT engine

  trtexec --onnx=<onnx_file> --explicitBatch --saveEngine=<tensorRT_engine_file> --workspace=<size_in_megabytes> --fp16

  • Note: If you want to use int8 mode in conversion, extra int8 calibration is needed.

• Run the demo

  python demo_trt.py <tensorRT_engine_file> <input_image> <input_H> <input_W>

  • This demo here only works when batchSize=1, but you can update this demo a little for batched inputs.

  • Note1: input_H and input_W should agree with the input size in the original ONNX file.

  • Note2: extra NMS operations are needed for the tensorRT output. This demo uses python NMS code from tool/utils.py.

  • Inference on X86 is verified to be okay for TensorRT 7.0, but output of the first iteration each time engine is loaded may be wrong on Jetson platforms. If you are using Jetpack 4.4 DP on Jetson platforms, try to ignore the first iteration each time as a workaround.

6. ONNX2Tensorflow

• First:Conversion to ONNX

  tensorflow >=2.0

  1: Thanks:github:https://github.com/onnx/onnx-tensorflow

  2: Run git clone https://github.com/onnx/onnx-tensorflow.git && cd onnx-tensorflow Run pip install -e .

  Note:Errors will occur when using "pip install onnx-tf", at least for me,it is recommended to use source code installation

Reference:

• https://github.com/eriklindernoren/PyTorch-YOLOv3
• https://github.com/marvis/pytorch-caffe-darknet-convert
• https://github.com/marvis/pytorch-yolo3

@article{yolov4,
  title={YOLOv4: YOLOv4: Optimal Speed and Accuracy of Object Detection},
  author={Alexey Bochkovskiy, Chien-Yao Wang, Hong-Yuan Mark Liao},
  journal = {arXiv},
  year={2020}
}