fix missing source (#396)

This PR fixes a bug that was found when working with `unstructured`:
https://github.com/Unstructured-IO/unstructured/actions/runs/11403980075/job/31732726752#step:6:1778

## test

- this PR should fix the failing test above in `unstructured` ci
- this PR expands the test on `clean_layoutelements` to test `source` is
kept

## note for release

Since we have not tagged a release for 0.7.42 this PR opt to not
increase version number and include itself as part of 0.7.42

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 0.7.42
 
+* fix: fix missing source after cleaning layout elements
 * Remove chipper model
 
 ## 0.7.41

test_unstructured_inference/test_elements.py

@@ -61,6 +61,7 @@ def test_layoutelements():
         element_coords=coords,
         element_class_ids=element_class_ids,
         element_class_id_map=class_map,
+        source="yolox",
     )
 
 
@@ -345,6 +346,7 @@ def test_clean_layoutelements(test_layoutelements):
         elements[1].bbox.x2,
         elements[1].bbox.x2,
     ) == (2, 2, 3, 3)
+    assert elements[0].source == elements[1].source == "yolox"
 
 
 @pytest.mark.parametrize(

unstructured_inference/inference/layoutelement.py

@@ -73,13 +73,15 @@ def slice(self, indices) -> LayoutElements:
     @classmethod
     def concatenate(cls, groups: Iterable[LayoutElements]) -> LayoutElements:
         """concatenate a sequence of LayoutElements in order as one LayoutElements"""
-        coords, texts, probs, class_ids = [], [], [], []
+        coords, texts, probs, class_ids, sources = [], [], [], [], []
         class_id_map = {}
         for group in groups:
             coords.append(group.element_coords)
             texts.append(group.texts)
             probs.append(group.element_probs)
             class_ids.append(group.element_class_ids)
+            if group.source:
+                sources.append(group.source)
             if group.element_class_id_map:
                 class_id_map.update(group.element_class_id_map)
         return cls(
@@ -88,7 +90,7 @@ def concatenate(cls, groups: Iterable[LayoutElements]) -> LayoutElements:
             element_probs=np.concatenate(probs),
             element_class_ids=np.concatenate(class_ids),
             element_class_id_map=class_id_map,
-            source=group.source,
+            source=sources[0] if sources else None,
         )
 
     def as_list(self):
@@ -439,7 +441,10 @@ def clean_layoutelements(elements: LayoutElements, subregion_threshold: float =
     final_coords = sorted_coords[mask]
     sorted_by_y1 = np.argsort(final_coords[:, 1])
 
-    final_attrs: dict[str, Any] = {"element_class_id_map": elements.element_class_id_map}
+    final_attrs: dict[str, Any] = {
+        "element_class_id_map": elements.element_class_id_map,
+        "source": elements.source,
+    }
     for attr in ("element_class_ids", "element_probs", "texts"):
         if (original_attr := getattr(elements, attr)) is None:
             continue