Simulations

Interactive machine learning simulations, grouped by topic.

Regression

Linear Regression Simulator

Fit a line and see how slope and intercept change the predictions.

3D Linear Regression Sandbox

A regression plane in three dimensions.

Polynomial Regression Simulator

Fit a curve and watch how the degree changes the shape.

Multiple Linear Regression

Stack an intercept and several inputs to predict an outcome.

Classification

Logistic Regression Simulator

See how a logistic model separates two classes.

Interactive KNN Simulator

Classify a point from its nearest neighbors.

SVM Simulator

See how a SVM separates two classes.

SVM Kernel Trick Simulator

Map data into a higher dimension so a line can separate the classes.

Clustering

K-Means Clustering Simulator

Step through cluster assignment and centroid updates.

Statistics

Understanding Standard Deviation

Move the points and watch how spread changes the standard deviation.

Standard Deviation Calculator

Move five data points and see the variance and standard deviation update.

Central Limit Theorem

Watch sample means form a bell shape as the sample size grows.

Confidence Interval Simulation

See how often an interval captures the true value.

Confidence Interval Calculation

Walk through the steps that turn a mean, sample size, and spread into an interval.

Hypothesis Testing Simulation

Compare a sample with a claim and decide whether the difference is large enough.

Understanding the P-Value

See how unusual a result is when the null hypothesis is true.

Fitting and evaluation

Bias & Variance Simulator

Watch predictions scatter around a target as bias and variance change.

Gradient Descent Simulator

Watch a model step downhill toward a lower error.

K-Fold Cross Validation Simulator

Split the data into folds and see how the score changes.

Neural networks

Perceptron Simulator

Adjust the inputs, weights, and bias of a single neuron.

Backpropagation Simulator

Step through how a small network learns from its error.

Neural Network Sandbox

Build a small network and see how the layers respond.

Decision trees

Entropy & Information Gain

See how a split reduces uncertainty in the labels.

Multi-Feature Decision Tree Split

Compare features and pick the split that separates the data.

Decision Tree Simulator

Split the data and watch the tree grow.

Interactive Decision Tree Builder

Choose each split yourself and watch the tree grow.

Ensembles

Bagging Simulator

Bootstrap several models and combine their votes.

Random Forest Simulator

Grow a forest of trees and see the combined prediction.

Tree vs Ensemble

Compare one decision tree with a random forest.

AdaBoost Simulator

Watch later models focus on the points earlier ones missed.

Stacking Classifier Simulator

Combine several models with a second model on top.