SHAP (SHapley Additive exPlanations) is a game theoretic approach to explain the output of any machine learning model. It connects optimal credit allocation with local explanations using the classic Shapley values from game theory and their related extensions. While SHAP can explain the output of any machine learning model, Lundberg and his collaborators have developed a high-speed exact algorithm for tree ensemble methods [1], [2].
The Tree SHAP Random Forest Predictor is used as a substitute to the Random Forest Predictor. Simply replace every Random Forest Predictor with this node to get started. If you are using a different tree based method, consider the other nodes in this package.
The beautiful thing about SHAP values is the intuitive interpretation. Every model has an expected output, the average prediction. The model prediction for a data row is the expected output plus the summation of SHAP values. This leads to intuitive explanations, for example in predictive maintenance "The high production output over the last three months contributed +20% probability that the machine breaks down in the next month.".
If you need help integrating explainable machine learning methods in your company, please contact me at morriskurz@gmail.com
All credits to the original research and development of the C++ and Python code go to Lundberg and his collaborators.
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To use this node in KNIME, install the extension TreeSHAP - Explainable Machine Learning in KNIME from the below update site following our NodePit Product and Node Installation Guide:
A zipped version of the software site can be downloaded here.
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