| min_var | Select columns with minimum amount of variance |
| scale_count | Apply various transformations to numeric (and non-id) data |
| scale_log | Apply various transformations to numeric (and non-id) data |
| scale_normal | Apply various transformations to numeric (and non-id) data |
| scale_sqrt | Apply various transformations to numeric (and non-id) data |
| scale_standard | Apply various transformations to numeric (and non-id) data |
| textfeatures | textfeatures |