modelName attribute is not mandatory from PMML specs.

With this ticket a "default" one will be provided soon after pmml file is "unmarshalled" to pmml java instance.

Generated name would be

Pmml File Name + model type + index (inside models list)

e.g.

Pmml File "TestSample.pmml"

Model type "Regression"

Position : second (index =1)

generated modelName

TestSampleRegression1