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Create YOLO model from scratch

In this tutorial we will be building a YOLO model from scratch. Once completed you will have a good understanding of all object detector components.

18 min readJul 15, 2026

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Object detection

Introduction

YOLO is a very popular computer vision model used for object detection and classification. It’s fast and reliable as the name suggest: You Only Look Once.

We’ll build a YOLOv3 style detector from scratch in PyTorch: computing anchors, building dense targets, writing the training loop, and training on Pascal VOC.

This is for readers comfortable with Python and basic PyTorch (tensors, nn.Module, optimizers) who want to understand how YOLO works under the hood.

Prerequisites

To complete this tutorial software programming knowledge is absolutely necessary. A working software development environment is also crucial. It’s assumed that the reader has all the necessary tools configured, for example Visual Studio Code, Anaconda and Python. Familiarity with basic convolutional networks and GPU training is recommended.

Training Pipeline — High Level Overview

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Arek Jaworski
Arek Jaworski

Written by Arek Jaworski

Software Architect — AWS/Node.JS/JavaScript Contractor and Tutor. Combing industry experience with research!