Predictive Faithfulness

Learn to evaluate the predictive faithfulness of an explanation using the Prediction Gap on Important feature perturbation (PGI) metric.

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Predictive faithfulness measures the faithfulness of a post-hoc explanation in the absence of a ground-truth explanation. Prediction Gap on Important feature perturbation (PGI) is a popular predictive faithfulness metric that measures the difference in the prediction probability that results from perturbing the Top-k influential features of the given post-hoc explanation.

In other words, given a post-hoc explanation SS of an image XX with respect to a neural network f(.)f(.), we define a Top-k mask MkM_k as follows:

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