only¶

Columns marked with a subrole in this submodule will only be used for the specified purpose and nothing else.

Example:

# Only the EmailDomain preprocessor will be applied
# to "emails". All other preprocessors, feature learners,
# feature selectors and predictors will ignore this column.
my_data_frame.set_subroles("emails", getml.data.subroles.only.email)

Attributes

`email`	A column with this subrole will only be used for the `EmailDomain` preprocessor and nothing else.
`substring`	A column with this subrole will only be used for the `Substring` preprocessor and nothing else.