The latest articles on DEV Community by Niraj singh (@nirajsingh0878). https://dev.to/nirajsingh0878 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3342052%2F87b318c6-e276-4ef6-a83d-24a977113df4.jpg https://dev.to/nirajsingh0878 en Niraj singh Thu, 10 Jul 2025 11:15:00 +0000 https://dev.to/nirajsingh0878/understand-decision-trees-by-building-one-from-scratch-445k https://dev.to/nirajsingh0878/understand-decision-trees-by-building-one-from-scratch-445k <p>Decision Trees are one of the simplest yet most powerful algorithms in machine learning. But how do they actually work under the hood?</p> <p>In this article, I break it down using a small toy dataset to walk through the entire process of building a decision tree by hand. No frameworks, no shortcuts — just pure logic.</p> <p>You'll learn:</p> <p>What entropy and information gain are</p> <p>How to choose the best features for splitting</p> <p>How to stop the tree from overgrowing</p> <p>Step-by-step math behind the splits</p> <p>Whether you're a beginner or brushing up on fundamentals, this hands-on approach will give you a deeper understanding of how classification trees work.</p> <p>📖 <a href="https://medium.com/@nirajsingh0878/how-do-decision-trees-work-can-you-build-a-decision-tree-by-hand-ab529bdb58cc" rel="noopener noreferrer">Read the full article on Medium</a></p> <p>I'd love to hear your feedback or questions in the comments!</p> machinelearning ai datascience