Some algorithms support joint optimization of the task across multiple outputs, which can improve results compared to using multiple independent models.
To leverage multiple outputs in PostgresML, you'll need to substitute the standard usage of
pgml.train_joint(), which has the same API, except the notable exception of
y_column_name parameter, which now accepts an array instead of a simple string.
SELECT * FROM pgml.train_join( 'My Joint Project', task => 'regression', relation_name => 'my_table', y_column_name => ARRAY['target_a', 'target_b'], );
You can read more in scikit-learn documentation.
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