imodels: Simplifying Machine Learning with Interpretable Models

Interpreting decisions made by complex modern machine learning models can be challenging.

Interpreting decisions made by complex modern machine learning models can be challenging. imodels works like scikit-learn models and can replace black-box models (e.g. random forests) with simpler and interpretable alternatives (e.g. rule lists) without losing accuracy.

Here’s an example of fitting an interpretable decision tree to predict juvenile delinquency:

from sklearn.model_selection import train_test_split
from imodels import get_clean_dataset, HSTreeClassifierCV 

# Prepare data
X, y, feature_names = get_clean_dataset('juvenile')
X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=42)

# Initialize a tree model and specify only 4 leaf nodes
model = HSTreeClassifierCV(max_leaf_nodes=4)  
model.fit(X_train, y_train, feature_names=feature_names)  

# Make predictions
preds = model.predict(X_test) 

# Print the model
print(model)
> ------------------------------
> Decision Tree with Hierarchical Shrinkage
>     Prediction is made by looking at the value in the appropriate leaf of the tree
> ------------------------------
|--- friends_broken_in_steal:1 <= 0.50
|   |--- physically_ass:0 <= 0.50
|   |   |--- weights: [0.71, 0.29] class: 0.0
|   |--- physically_ass:0 >  0.50
|   |   |--- weights: [0.95, 0.05] class: 0.0
|--- friends_broken_in_steal:1 >  0.50
|   |--- non-exp_past_year_marijuana:0 <= 0.50
|   |   |--- weights: [0.33, 0.67] class: 1.0
|   |--- non-exp_past_year_marijuana:0 >  0.50
|   |   |--- weights: [0.60, 0.40] class: 0.0

This tree structure clearly shows how predictions are made based on feature values, providing transparency into the model’s decision-making process.

Link to models.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top

Work with Khuyen Tran

Work with Khuyen Tran