fix aggregating sparse multiclass explanations to global in global-only streaming with batches mode #519
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Fix aggregating sparse multiclass explanations to global in global-only streaming with batches mode.
In the case that the explanations are
1.) computed on sparse multiclass data, and
2.) we set parameters to only compute the global explanation from local importance values, and
3.) we are using specifically the streaming aggregation from batches mode
(notice a lot of specific cases there), the logic currently fails as it is not designed to handle a list of sparse matrices. The logic for this scenario is implemented in this PR and a test is added.