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Sebastian Raschka, 2015

Python Machine Learning - Code Examples

Chapter 6 - Learning Best Practices for Model Evaluation and Hyperparameter Tuning

  • Streamlining workflows with pipelines
    • Loading the Breast Cancer Wisconsin dataset
    • Combining transformers and estimators in a pipeline
  • Using k-fold cross-validation to assess model performance
    • The holdout method
    • K-fold cross-validation
  • Debugging algorithms with learning and validation curves
    • Diagnosing bias and variance problems with learning curves
    • Addressing overfitting and underfitting with validation curves
  • Fine-tuning machine learning models via grid search
    • Tuning hyperparameters via grid search
    • Algorithm selection with nested cross-validation
  • Looking at different performance evaluation metrics
    • Reading a confusion matrix
    • Optimizing the precision and recall of a classification model
    • Plotting a receiver operating characteristic
    • The scoring metrics for multiclass classification
  • Summary