CHANGES.md

@@ -1,5 +1,9 @@
 # `bw2calc` Changelog
 
+# 2.0.2 (2025-03-21)
+
+* Fix [#110](https://github.com/brightway-lca/brightway2-calc/issues/119): Method `invert_technosphere_matrix` crashes with multi LCA
+
 # 2.0.1 (2024-12-10)
 
 * Update `matrix_utils` dependency

bw2calc/__init__.py

@@ -9,7 +9,7 @@
     "MultiLCA",
 ]
 
-__version__ = "2.0.1"
+__version__ = "2.0.2"
 
 
 import platform

bw2calc/lca_base.py

@@ -245,7 +245,7 @@ def invert_technosphere_matrix(self):
 
         See `Intel forum <https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/ How-to-find-inverse-of-a-sparse-matrix-using-pardiso/m-p/1165970#M28249>`__
         for a discussion on why we use this approach."""  # noqa: E501
-        assert hasattr(self, "inventory"), "Must do lci first"
+        assert hasattr(self, "technosphere_matrix"), "Must load lci data first"
 
         if not PYPARDISO:
             warnings.warn(

tests/multi_lca.py

@@ -630,3 +630,15 @@ def test_pass_full_methodconfig(dps, func_units):
         == 3 * (3 * 10 + 1 * 10) * 84
     )
     assert mlca.scores[(("w", "1"), ("n", "1"), ("first", "category"), "γ")] == 3 * 42
+
+
+def test_inventory_matrix_inversion(dps, config, func_units):
+    mlca = MultiLCA(demands=func_units, method_config=config, data_objs=dps)
+    with pytest.raises(AssertionError):
+        mlca.invert_technosphere_matrix()
+
+    mlca.load_lci_data()
+
+    result = mlca.invert_technosphere_matrix()
+    assert isinstance(result, np.ndarray)
+    assert result.sum()