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On this page
  • Constraint API
  • Usage
  1. Concepts
  2. Constraints
  3. ❖ Constraint Augmented Generation (CAG)

❖ UniqueBridgeTable

Previous❖ ReferenceTableNextTroubleshooting

Last updated 15 days ago

Use the UniqueBridgeTable constraint when you have a bridge table that records a many-to-many relationship between multiple tables, and the connections have to be unique. That is to say, the combinations of keys in the bridge tables must be unique.

Constraint API

Create a UniqueBridgeTable constraint.

Parameters:

  • (required) table_name: A string with the name of the bridge table

  • (required) foreign_key_columns: A list of strings with the names of the foreign key columns. The combination of values in these columns must be unique.

from sdv.cag import UniqueBridgeTable

my_constraint = UniqueBridgeTable(
    table_name='Author-Book',
    foreign_key_columns=['Author ID', 'Book ID'])

Usage

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

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

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

Make sure that all the tables and columns you provide are listed in your , as well as all foreign key connections.

Metadata
The Author-Book table records unique links between Authors and Books.

❖ 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 page.

CAG Bundle