Fixing an NPE in LIMEExplanation.getActiveFeatures() #157
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Description
SparseModels which only had a single feature set (rather than one per output dimension) caused an NPE in
LIMEExplanation.toString()and other places which tried to use the output ofLIMEExplanation.getActiveFeatures().Motivation
LIME should work with any SparseTrainer, and the explanations should not throw NPE anywhere.
Noticed when looking at #156.