feat: PreloadsImaging + shared source-plane mesh fields (multi-exposure shared-state, phase 2/4)

autoarray/__init__.py

@@ -29,6 +29,7 @@
 from .settings import Settings
 from .inversion.inversion.abstract import AbstractInversion
 from .preloads import AbstractPreloads
+from .preloads import PreloadsImaging
 from .preloads import PreloadsInterferometer
 from .inversion.regularization.abstract import AbstractRegularization
 from .inversion.inversion.factory import inversion_from as Inversion

autoarray/preloads/__init__.py

@@ -1,2 +1,3 @@
 from .abstract import AbstractPreloads
+from .imaging import PreloadsImaging
 from .interferometer import PreloadsInterferometer

autoarray/preloads/abstract.py

@@ -1,5 +1,11 @@
 class AbstractPreloads:
-    def __init__(self, curvature_matrix=None, mapper_galaxy_dict=None):
+    def __init__(
+        self,
+        curvature_matrix=None,
+        mapper_galaxy_dict=None,
+        source_plane_mesh_grid=None,
+        image_plane_mesh_grid=None,
+    ):
         """
         Container for quantities that are *preloaded* into a fit / inversion: computed once and
         injected so that repeated evaluations reuse them instead of recomputing them.
@@ -42,7 +48,24 @@ def __init__(self, curvature_matrix=None, mapper_galaxy_dict=None):
             plane); when invariant across evaluations it is built once and reused here, so the
             `mapper` (and therefore the `mapping_matrix` and `regularization_matrix`) is not rebuilt.
             Stored opaquely — the consumer (e.g. PyAutoLens's `TracerToInversion`) populates and
-            interprets it.
+            interprets it. Valid ONLY when the datasets sharing it have identical grids (e.g. the
+            channels of a datacube) — a mapper embeds a dataset's own data-grid mappings.
+        source_plane_mesh_grid
+            The pre-computed source-plane mesh geometry (e.g. the ray-traced centres a Delaunay
+            triangulation is built over), for consumers whose datasets share a lens model but NOT
+            their grids (e.g. multi-exposure imaging with per-exposure pixel offsets and PSFs).
+            Unlike `mapper_galaxy_dict`, this preloads only the mesh: each dataset still builds its
+            own mapper by mapping its own (offset) data grid onto this shared mesh. Stored opaquely
+            in the consumer's plane-grouped structure (PyAutoLens: the `traced_mesh_grid_pg_list`
+            of the lead dataset). The mapping matrix, curvature matrix, blurred mapping matrix and
+            regularization matrix are all deliberately NOT preloadable this way — offsets/PSFs make
+            the first three per-dataset, and regularization may be data-adaptive.
+        image_plane_mesh_grid
+            The image-plane counterpart of `source_plane_mesh_grid` (the mesh centres before
+            ray-tracing, in the lead dataset's frame), carried alongside it as metadata for
+            downstream consumers (e.g. mapper plotting). Same opaque plane-grouped structure.
         """
         self.curvature_matrix = curvature_matrix
         self.mapper_galaxy_dict = mapper_galaxy_dict
+        self.source_plane_mesh_grid = source_plane_mesh_grid
+        self.image_plane_mesh_grid = image_plane_mesh_grid

autoarray/preloads/imaging.py

@@ -0,0 +1,35 @@
+from autoarray.preloads.abstract import AbstractPreloads
+
+
+class PreloadsImaging(AbstractPreloads):
+    def __init__(self, source_plane_mesh_grid=None, image_plane_mesh_grid=None):
+        """
+        Preloaded quantities for an imaging fit / inversion (see `AbstractPreloads`).
+
+        This is the consumer-facing preloads container for imaging data — for example the object
+        returned by `AnalysisImaging.shared_state_from` for the multi-exposure shared-state path,
+        where exposures of the same lens (at the same or different wavelengths, with per-exposure
+        pixel offsets) share one source-plane mesh.
+
+        The invariance contract differs from the datacube (`PreloadsInterferometer`) case, whose
+        channels share a single real-space grid and can therefore preload the whole mapper and
+        curvature matrix. Imaging exposures have per-exposure PSFs and pixel offsets, so:
+
+        - the source-plane mesh geometry IS shareable (a pure function of the shared lens model and
+          the lead exposure's image-mesh) — preloaded here;
+        - the mapper, mapping matrix, blurred mapping matrix and curvature matrix are NOT (each
+          exposure maps its own offset grid onto the shared mesh and blurs with its own PSF);
+        - the regularization matrix is NOT (regularization may adapt to per-exposure data).
+
+        Parameters
+        ----------
+        source_plane_mesh_grid
+            The shared source-plane mesh geometry, traced once from the lead exposure. See
+            `AbstractPreloads`.
+        image_plane_mesh_grid
+            Its image-plane counterpart in the lead exposure's frame. See `AbstractPreloads`.
+        """
+        super().__init__(
+            source_plane_mesh_grid=source_plane_mesh_grid,
+            image_plane_mesh_grid=image_plane_mesh_grid,
+        )

test_autoarray/preloads/test_preloads.py

@@ -0,0 +1,29 @@
+import autoarray as aa
+
+
+def test__abstract_preloads__all_fields_default_none():
+    preloads = aa.AbstractPreloads()
+
+    assert preloads.curvature_matrix is None
+    assert preloads.mapper_galaxy_dict is None
+    assert preloads.source_plane_mesh_grid is None
+    assert preloads.image_plane_mesh_grid is None
+
+
+def test__preloads_imaging__carries_mesh_geometry_only():
+    preloads = aa.PreloadsImaging(
+        source_plane_mesh_grid=[["mesh"]], image_plane_mesh_grid=[["image_mesh"]]
+    )
+
+    assert preloads.source_plane_mesh_grid == [["mesh"]]
+    assert preloads.image_plane_mesh_grid == [["image_mesh"]]
+    assert preloads.curvature_matrix is None
+    assert preloads.mapper_galaxy_dict is None
+
+
+def test__preloads_interferometer__mesh_fields_available_via_abstract():
+    preloads = aa.PreloadsInterferometer(curvature_matrix="F")
+
+    assert preloads.curvature_matrix == "F"
+    assert preloads.source_plane_mesh_grid is None
+    assert preloads.image_plane_mesh_grid is None