JoaoPBSousa
commented
2 years ago Hello @xydisla,
This error occurs when using TimeSHAP's pruning and the baseline score is very close to the score of the instance being explained. TimeSHAP, and KernelSHAP, explain the difference in score between the baseline and the explained instance, if this score is small, the explanation values will be small and therefore TimeSHAP's pruning algorithm cannot operate. To solve this issue you have two options: 1. Skip the pruning algorithm. This error is raised when applying the pruning algorithm, if you skip it, TimeSHAP should calculate the event and feature explanations, albeit with very small contributions. 2. Change the baseline sequence. Consider changing the baseline instance. If you are explaining an instance with class label 1, consider using the average of all instances of class 0 as the baseline, and vice-versa, if explaining class 0, use the average of all sequences of class 1.
If you have any further questions, don't hesitate to contact us.
While calculating a global report, I'm currently running into errors that "Score difference between baseline and instance is too low < 0.1...Consider choosing another baseline." My baselines have been the average_event and average_sequence. I also notice that occasionally the values in the error change with different pruning tolerance, but not in a consistent way. Do you have advice for dealing with this? Thanks.