Uma Mahesh

Backpropagation and gradient descent form the computational core of modern neural network training. Gradient descent provides the optimization framework for minimizing a loss function, while backpropagation provides the efficient mechanism for computing the gradients required by that optimization. Together, they…

Neural networks are one of the most influential model families in machine learning. Their modern success in computer vision, natural language processing, speech recognition, recommender systems, and scientific modeling traces back to a simple foundational idea: compose many parameterized linear…

Hyperparameter tuning is one of the most important steps in practical machine learning. Even a strong learning algorithm can underperform badly if its configuration is poorly chosen. This whitepaper provides a detailed technical treatment of hyperparameter optimization, with special focus…

Gradient Boosting Machines are among the most powerful algorithms for structured and tabular data. They build predictive models in a stage-wise additive manner, where each new learner is trained to correct the residual errors of the current ensemble. This whitepaper…

Ensemble methods combine multiple models to produce a predictor that is typically more accurate, more stable, and more robust than any single constituent model. The central idea is that a collection of imperfect learners can, under the right combination strategy,…

Dimensionality reduction is a core technique in machine learning, statistics, signal processing, and data mining. Its goal is to transform high-dimensional data into a lower-dimensional representation that preserves as much useful structure as possible. This whitepaper provides a detailed technical…

Clustering is one of the most important families of unsupervised learning techniques. Its objective is to group unlabeled data points into meaningful subsets such that points within the same group are more similar to each other than to points in…

Naive Bayes is a family of probabilistic classifiers based on Bayes’ theorem and a strong conditional independence assumption among features. Despite the simplicity of that assumption, Naive Bayes remains one of the most effective, computationally efficient, and interpretable baseline classifiers…

K-Nearest Neighbors (KNN) is one of the most intuitive non-parametric supervised learning algorithms. It is used for both classification and regression, and it operates on a simple idea: similar observations tend to have similar outputs. Unlike models that explicitly learn…