Gradient Boosting (XGBOOST) Tree

  • By Sagar Gade
  • March 25, 2023
  • Machine Learning

Gradient Boosting  (XGBOOST) Tree

Introduction to Gradient Boosting 

  • Gradient Boosted Trees is one of the most commonly used “Boosting” algorithms. This is a type of Supervised Learning algorithm. 
  • There are different boosting algorithm that exists. Here, we will only consider the Gradient Boosting algorithm.  
  • Boosting is a collection of weak learners combined to form a stronger learner.  
  • Gradient Boosting can be applied for both “Regression and Classification”


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  • Gradient Boosting is a type of Ensemble Learning.  
  • Ensemble Learning is the process by which multiple models, such as classifiers, and experts, are generated and combined to solve a particular problem.  
  • Ensemble Learning is primarily used to improve classification,  prediction, function approximation, etc.

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  • The Gradient Boosting algorithm can be classified into two key features: 
  1. Multiple Iterations 
  2. Each subsequent iteration focus on the parts of the problem that the previous iteration got wrong.

Gradient Boosting (XGBOOST) Tree



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Let’s understand the algorithm by taking a very simple example.  

  • Suppose you are a Data Science teacher teaching a class of 20 students from different educational backgrounds.  
  • On day 1, you know nothing about the quality of those 20 students so you start with standard/basic  class (like basic stats) 
  • On day 2 or subsequent days, you have some background of how well each student is doing. So, you will focus more only on those students who are very weak in Data Science or the worst students. Here, your goal is to make the best students perfect but you will bring vulnerable students to average.  
  • So as a good teacher, you will first concentrate on weak students and will try to make them average. 



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  • Now let’s relate this example to Boosting.  
  • Simple, the iterations take place at each subsequent day at each new class.  On each subsequent day, you will find weak students (errors) and will improve them.  
  • Another way to interpret is, a group of daily instructions (the weak learners) can be  combined to produce a good quality course (the strong learner)

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Sagar Gade

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