Adult dataset preprocessed

The files "adult_train.csv" and "adult_test.csv" contain preprocessed versions of the Adult dataset from the USI repository.

The file "adult_preprocessing.ipynb" contains a python notebook file with all the preprocessing steps used to generate "adult_train.csv" and "adult_test.csv" from the original Adult dataset.

The preprocessing steps include:

One-hot-encoding of categorical values

Imputation of missing values using knn-imputer with k=1

Standard scaling of ordinal attributes

Note: we assume the scenario when the test set is available before training (every attribute besides the target - "income"), therefore we combine train and test sets before the preprocessing.