Add assign_transformers and get_transformers methods to synthesizers

[amontanez24]

Problem Description

As a user, it would be useful if I could call a method that autonomously assigns transformers to my data using the metadata. It would also be helpful if I could examine those transformers afterwards.

Expected behavior

Add auto_assign_transformers method to BaseSynthesizer

• Parameters:
  • data (pd.DataFrame): The raw data.
• This method should use the DataProcessor to do the following:
  1. Transform the constraints
  2. Create the config for the HyperTransformer and set it
• This method SHOULD NOT fit the HyperTransformer

Add get_transformers method to BaseSynthesizer

• This method should return a dictionary mapping the column name to the actual transformer object that will be used. This is essentially the transformers section of the HyperTransformer's config.
• Errors:
  • If the auto_assign_transformers has not already been called, then this should crash
    Error: No transformers were returned in 'get_transformers'. Use 'assign_transformers' or 'fit' to create them.

Additional context

• The auto_assign_transformers method can be used in some circumstances in the preprocess_data method in Add preprocess method to synthesizers #1018