Weka Scoring
This step allows you to use the Weka scoring plugin in PDI.
The Weka scoring plugin is a tool that allows classification and clustering models created with Weka to be used to score (attach a prediction to incoming rows of data) new data as part of a Kettle transform.
For more information, including procedures on how to use this step, see Using the Weka Scoring Plugin on the WEKA wiki page.