how to perform predictions using the C-API with Category type features

[arjen-Lee1993]

In my model, some features are of the category type (they are enumerations of string values). How can I perform predictions using the C-API? In the tests I've seen, the input is always a vector, but my input for categorical features is a string variable.

[boneatjp]

I'm using LGBM_DatasetCreateFromFile, with the second parameter, "categorical_features=name:???" to add categorical features.