why PMMLEvaluationContext is invisible？ about jpmml-evaluator HOT 1 CLOSED

Why do that?

Class EvaluationContext (and its subclasses) are not part of the public API. In fact, I can't imagine a valid/supproted workflow, where it would be necessary to work with it directly.

In the lastest version, how can I do DataTransformation(PMML file only contain ) in another way?

Class PMMLEvaluationContext has been removed in the 1.3.X development branch altogether. The reason is that the PMML specificiation does not define rules for performing evaluations "outside" of a Model element. The case in point is the requirement that "all fields values must flow through the MiningSchema element" - it's necessary to apply all sorts of missing/invalid/outlier treatments to a field value before it becomes usable.

You could emulate PMMLEvaluationContext by inserting a dummy Model element into your PMML document, and using the associated ModelEvaluationContext instead.

Also, please note that you can always use Java reflection to bypass such constraints. If you know that there is a private constructor that you absolutely must use, then look it up using Class#getDeclaredConstructor(Class...), and make it accessible by calling Constructor#setAccessible(true) on it.

Thanks for pointing out this "leaky" abstraction - I'll go and tighten screws in this area even more in the subsequent 1.3.X versions :-)

from jpmml-evaluator.