Book Image

Interpretable Machine Learning with Python - Second Edition

By : Serg Masís
4 (4)
Book Image

Interpretable Machine Learning with Python - Second Edition

4 (4)
By: Serg Masís

Overview of this book

Interpretable Machine Learning with Python, Second Edition, brings to light the key concepts of interpreting machine learning models by analyzing real-world data, providing you with a wide range of skills and tools to decipher the results of even the most complex models. Build your interpretability toolkit with several use cases, from flight delay prediction to waste classification to COMPAS risk assessment scores. This book is full of useful techniques, introducing them to the right use case. Learn traditional methods, such as feature importance and partial dependence plots to integrated gradients for NLP interpretations and gradient-based attribution methods, such as saliency maps. In addition to the step-by-step code, you’ll get hands-on with tuning models and training data for interpretability by reducing complexity, mitigating bias, placing guardrails, and enhancing reliability. By the end of the book, you’ll be confident in tackling interpretability challenges with black-box models using tabular, language, image, and time series data.
Table of Contents (17 chapters)
15
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16
Index

Understanding anchor explanations

In Chapter 5, Local Model-Agnostic Interpretation Methods, we learned that LIME trains a local surrogate model (specifically a weighted sparse linear model) on a perturbed version of your dataset in the neighborhood of your instance of interest. The result is that you approximate a local decision boundary that can help you interpret the model’s prediction for it.

Like LIME, anchors are also derived from a model-agnostic perturbation-based strategy. However, they are not about the decision boundary but the decision region. Anchors are also known as scoped rules because they list some decision rules that apply to your instance and its perturbed neighborhood. This neighborhood is also known as the perturbation space. An important detail is to what extent the rules apply to it, known as precision.

Imagine the neighborhood around your instance. You would expect the points to have more similar predictions the closer you got to your instance...