Non-parametric models: k-nearest neighbors, decision trees, and random forests. Introducing cross-validation, hyperparameter tuning, and ensemble models. — This series is available as a full-length e-book! Download here. Free for download, contributions appreciated (paypal.me/ml4h) Non-parametric learners. Things are about to get a little… wiggly. In contrast to the methods we’ve covered so far — linear regression, logistic regression, and SVMs where the form of the model was pre-defined — non-parametric…