Amended -Execute failed: (“NullPointerException”): null Decision Tree Ruleset-

[aworker]

Good day @nemad & @temesgen-dadi

and thanks for your replies that I appreciate.

@nemad

That’s a very valid point but I’d argue the node that should show a warning is the Decision Tree Learner, not the Decision Tree to Ruleset node because the problem is really located in the former (and the latter is far less prevalent).
What do you think of this solution?

Indeed, I definitely agree that the Decision Tree Learner (DTL) should at least show a warning stating that the Training set has only one defined class. I would even say that it should definitely fail and return an error because a DT such as “TRUE=>SingleClass” is not really a DT and hence may not be informative at all.

My favorite solution would be that the DTL node fails and the DTTR at least warns of getting a weird DT.

My concern is that people may not know or just not notice, as it was the case in the initial thread (Execute failed: ("NullPointerException"): null Decision Tree Ruleset), that something was wrong upstream (here incorrectly setting a threshold to define classes) if the DTL does not warn or fails in this particular case.

But this is just my point of view

Thanks again @nemad & @temesgen-dadi for your explanations.

Best regards,

Ael