binningdiscretizationlinear modelsand trees interactions and polynomials univariate nonlinear transformations automatic feature selection univariate statistics model-based feature selection iterative feature selection utilizing expert knowledge summary and outlook model evaluation and improvement cross-validation cross-validation in scikit-learn benefits of cross-validation stratified -fold cross-validation and other strategies grid search simple grid search the danger of overfitting the parameters and the validation set grid search with cross-validation evaluation metrics and scoring keep the end goal in mind metrics for binary classification metrics for multiclass classification regression metrics using evaluation metrics in model selection summary and outlook algorithm chains and pipelines parameter selection with preprocessing building pipelines using pipelines in grid searches the general pipeline interface convenient pipeline creation with make_pipeline accessing step attributes accessing attributes in grid-searched pipeline grid-searching preprocessing steps and model parameters grid-searching which model to use summary and outlook working with text data types of data represented as strings table of contents