Easiest way to Train yolov7 on the custom dataset – 2023

Abhishek Sharma

5 months ago

Hey guys in this blog we will see how we can Train yolov7 on the custom dataset and create a Number Plate Detector.

Table of Contents

Sneak Peek at our Output…

Yolov7 is the new state-of-the-art real-time object detection model.

You can use it for different industrial applications. Also, you can optimize the model, that is, converting the model to ONNX, TensorRT, etc, which will increase the throughput and run the edge devices.

In this blog, we will see the step-by-step guide to Train yolov7 on the custom dataset.

So without any further due, let’s do it…

Step 1 – Clone YOLOv7 Repo

Clone the yolov7 repository from GitHub by running the following command in the terminal.

git clone https://github.com/WongKinYiu/yolov7.git

Step 2 – Install requirements

Inside the cloned yolov7 folder you will find a file called “requirements.txt”.
Open this File.
Remove Line 11 and Line 12 which are torch and torchvision.
We are doing so because we will install CUDA enabled torch and torchvision ahead.
After removing it, your file should look like the one below.

Create a new file called “requirements_gpu.txt” in the yolov7 folder.

Open this new file and paste the following content into that file.

-i https://download.pytorch.org/whl/cu113
torch==1.11.0+cu113
torchvision==0.12.0+cu113

Step 3 – Let’s Prepare the data

Create 2 folders; ‘images’ and ‘labels’. The images folder contains all the images and the labels folder contains all the annotations.
Create 2 folders; ‘train’ and ‘val’ in the data folder of the yolov7 directory.
Move 80% of images and labels to the train folder and the remaining 20% to the val folders we created above.

Step 4 – Editing Config Files

Now open the “coco.yaml” file from the data folder and delete the first 4 lines (till the download part).
Set ‘train: data/train‘
Set ‘val: data/val‘
Set ‘nc:1‘ (no of classes), Change it according to your need, I have just one class so I have set ‘nc:1‘.
Set names:[‘number plate’], Change it according to your need. The only class in my dataset is ‘number plate’ hence my names list has only one class.

Now open the yolov7/cfg/training and open the “yolov7.yaml” file there.
Just make one change in line 2; change the nc (no of classes), I will set it to 1 as I only have one class.

Step 5 – Download pre-trained yolov7 weights

Now we need to download pre-trained yolov7 weights.
Open the GitHub link https://github.com/WongKinYiu/yolov7#performance and click on YOLOv7.

Move the downloaded yolov7.pt file to the yolov7 folder.
Our yolov7 folder should look like this.

Step 6 – Let’s Train yolov7 on the custom dataset

Open the drive and upload this folder to the drive.
Open Colab and create a new notebook. Set the runtime to GPU. Runtime > Change runtime type > GPU.
Run the following cell in the Colab Notebook.
If everything you did till now was correct, your training will start.

from google.colab import drive
drive.mount('/content/drive')

!pip install -r drive/MyDrive/yolov7/requirements.txt
!pip install -r drive/MyDrive/yolov7/requirements_gpu.txt

%cd drive/MyDrive/yolov7/
!python train.py --workers 1 --device 0 --batch-size 16 --epochs 100 --img 640 640 --hyp data/hyp.scratch.custom.yaml --name yolov7-custom --weights yolov7.pt

You can change the epochs according to your need.
Also, you can change the batch size according to your GPU. If the training gives a memory error, try reducing it.
As we are doing our training in the Colab Environment, we get a very good GPU for free, hence we can set the batch size to 16.

Step 7 -Testing our custom Model

Copy the “best.pt” weight file from the yolov7/runs/train/yolov7-custom/weights and paste it into the yolov7 folder.
Now in the yolov7 folder run the following test command.
Change the image name according to your need.
You can also replace it with a video name if you want to run it on a Video.

!python detect.py --weights best.pt --conf 0.5 --img-size 640 --source img.jpg --view-img --no-trace

For Colab Environment run the following command, because e can’t view image in Colab.

!python detect.py --weights best.pt --conf 0.5 --img-size 640 --source 1.mp4 --no-trace

Output

NOTE – If you ever need to change data in the ‘yolov7/data’ folder, make sure to delete cache files.

So in this way you can Train yolov7 on the custom dataset in the easiest way possible.

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