The Column You Forgot

A ColumnTransformer quietly drops any column you don't name, unless you tell it otherwise.

Task: write output_widths(table, scaled_columns).

• table is a dict mapping column names to lists of numbers. scaled_columns names some of them.
• Build two ColumnTransformers with one line each: ("numbers", StandardScaler(), scaled_columns).
  • The first uses the default remainder.
  • The second uses remainder="passthrough".
• Fit and transform the table with each one.
• Return [columns out of the first, columns out of the second].