I'm trying to familiarize myself with the random forest functions that come with Aster by recreating the carprices example used in the Teradata Aster Big Analytics Applicance 3H Analytics User Guide. I am able to generate a model using forest_drive, but when I try and predict based off of the model, forest_predict returns the following error:
the json data is not correct.
"leftCategories_" 's values is  , but  is not a correct value.
" rightCategories_" 's values is  , but  is not a correct value.
@Ji Zeng, unfortunately it seems json is correct. Try http://jsonlint.com/. Also my json perl validator doesn't protest.