❖ ReferenceTable

❖ SDV Enterprise Bundle. This feature is available as part of the CAG Bundle, an optional add-on to SDV Enterprise. For more information, please visit the CAG Bundle page.

Use the ReferenceTable constraint when you have a table that acts as an unchangeable reference. That is to say, you do not want to synthesize an new information in it; the table's contents should always remain as-is.

When you apply this constraint, the reference table's contents remains as-is. At the same time, synthetic data is generated for all other tables, including ones that link to the reference table.

In this example, the City table is a reference table. You do not want to synthesize new cities, but you do want to synthesize other tables that link to the cities such as Supplier, Product, etc.

Constraint API

This functionality is in Beta. At this time, select SDV Enterprise users have been invited to use this feature.

Create a ReferenceTable constraint

Parameters:

• (required) reference_table_names: A list of strings representing all the reference tables that are in your schema.

from sdv.cag import ReferenceTable

my_constraint = ReferenceTable(
    reference_table_names=['City'])

Make sure that all table names you provide are in your Metadata. Reference tables are not allowed to have any foreign key references to non-reference tables.

Usage

Apply the constraint to any SDV synthesizer. Then fit and sample as usual.

synthesizer = HSASynthesizer(metadata)
synthesizer.add_constraints([my_constraint])

synthesizer.fit(data)
synthetic_data = synthesizer.sample()

For more information about using predefined constraints, please see the Constraint-Augmented Generation tutorial.