Rapid Miner Accelerator - for Direct Marketing

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I had a couple of questions on the process design underlying the RM Accelerator for Direct Marketing, Hope someone can help. I am trying to learn the tool and see if I can build upon the DM accelerator.
a) What is the purpose of the Default Precision process (it is a sub-process)? I sort of understand what it does. But not sure why it is required?
b) What is the purpose of the Last Model operator - why not simply connect the model to the data set with missing "label" vaues and get the predictions
Thanks
a) What is the purpose of the Default Precision process (it is a sub-process)? I sort of understand what it does. But not sure why it is required?
b) What is the purpose of the Last Model operator - why not simply connect the model to the data set with missing "label" vaues and get the predictions
Thanks
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