手法を比較

	確率的勾配降下法 (SGD)	XGBoost
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	1951	2016
提唱者	Robbins, H. & Monro, S.	Chen, T. & Guestrin, C.
種類	First-order iterative optimization algorithm	Ensemble (gradient-boosted decision trees)
原典	Robbins, H. & Monro, S. (1951). A Stochastic Approximation Method. The Annals of Mathematical Statistics, 22(3), 400–407.	Chen, T. & Guestrin, C. (2016). XGBoost: A Scalable Tree Boosting System. Proceedings of the 22nd ACM SIGKDD, 785–794.
別名	SGD, online gradient descent, incremental gradient descent, mini-batch gradient descent	XGBoost, extreme gradient boosting, scalable tree boosting
関連	3	5
概要	Stochastic Gradient Descent (SGD) is a first-order iterative optimization algorithm, rooted in the stochastic approximation framework introduced by Robbins and Monro in 1951, that minimizes an objective function by updating model parameters using the gradient computed on a single randomly selected training example (or a small mini-batch) at each step. It is the core optimization engine behind modern machine learning and deep learning, enabling the training of models on datasets too large to fit in memory.	XGBoost (Extreme Gradient Boosting) is a scalable tree-boosting algorithm introduced by Tianqi Chen and Carlos Guestrin in 2016. It builds a strong predictor by adding decision trees one at a time, each correcting the errors left by the trees before it, and is a powerful prediction method widely used in competitions.