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test: pin MassField retention in chained lens models - #745
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Summary
Add a lens-side integration witness and cookbook example for field-aware mass chaining. The test composes a PowerLaw stage from an Isothermal stage, keeps the flat field prior path, builds a tracer with one field, and checks the fixed-field route. PyAutoLens already re-exports PyAutoGalaxy's chaining module, so no Lens source adapter is needed.
Refs PyAutoLabs/PyAutoGalaxy#624. Depends on PyAutoLabs/PyAutoGalaxy#625.
API Changes
The new
mass_and_fields_fromhelper from PyAutoGalaxy becomes available asal.util.chaining.mass_and_fields_fromthrough the existing module re-export. Existing PyAutoLens behavior is unchanged.See full details below.
Test Plan
pytest -q test_autolens/ -x: PASS.Full API Changes (for automation & release notes)
Removed
Added
autolens.util.chaining.mass_and_fields_from(mass, mass_result, *, fields_result, unfix_mass_centre=False)— re-export of the PyAutoGalaxy helper.Renamed
Changed Signature
Changed Behaviour
Migration
fieldin barefields=field;result.model.fieldskeeps posterior priors andresult.instance.fieldsfixes values.Generated by the PyAutoLabs agent workflow.