The package ExplainPrediction contains methods to generate explanations for individual predictions of classification and regression models.
The explanation methodology used is based on measuring contributions of individual features on an individual predictions. The contributions of all attributes present an explanation of individual prediction. Explanations can be visualized with a nomogram. If we average the explanations, we get an explanation of the whole model. Two explanation methods are implemented:
EXPLAIN (described in Explaining Classifications For Individual Instances). The EXPLAIN method is much faster
than IME and works for any number of attributes in the model, but cannot explain dependencies expressed disjunctively
in the model. For details see explainVis
.
IME can in principle explain any type of dependencies in the model. It uses sampling based method to avoid exhaustive search for dependencies and works reasonably fast for up to a few dozen attributes in the model. The details see the references.
Currently prediction models implemented in package CORElearn are supported,
for other models a wrapper of class CoreModel
has to be created.
The wrapper has to present the model with a list with the following components:
formula
of class formula
representing the response and predictive variables,
noClasses
number of class values in class of classification model, 0 in case of regression,
class.lev
the levels used in representation of class values (see factor
),
Additionally it has to implement function predict
which returns the same components as the function
predict.CoreModel
in the package CORElearn.
Further software and development versions of the package are available at http://lkm.fri.uni-lj.si/rmarko/software.
Marko Robnik-Sikonja
Marko Robnik-Sikonja, Igor Kononenko: Explaining Classifications For Individual Instances. IEEE Transactions on Knowledge and Data Engineering, 20:589-600, 2008
Erik Strumbelj, Igor Kononenko, Igor, Marko Robnik-Sikonja: Explaining Instance Classifications with Interactions of Subsets of Feature Values. Data and Knowledge Engineering, 68(10):886-904, Oct. 2009
Erik Strumbelj, Igor Kononenko: An Eficient Explanation of Individual Classifications using Game Theory, Journal of Machine Learning Research, 11(1):1-18, 2010.
Some references are available from http://lkm.fri.uni-lj.si/rmarko/papers/
Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.
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