How to classify unseen multi instance data?

Hi folks,

I have created quite a few models with the various multi instance 
classifiers available and would now like to use them to classify unseen 
multi instance data.

However, there appears to be no method in the Weka Java API to do this. 
The usual method for single instance data is:

AbstractClassifier.classifyInstance(Instance data);

However, for multi instance data I have Instances instead of Instance. 
So how do I classify an object of type Instances?

I could of course loop over all Instance objects contained in Instances 
and classify each of them, but that appears to be a series of single 
instance classifications, whereas the model was trained on multi 
instance data. Does that make sense at all?

Many thanks in advance for any pointers,

Ulrich

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