Finished

Test Name	Status
test_zero_matrix_add	Fail
test_issue_17624	Pass
test_bc_matmul	Pass
test_bc_matadd	Pass
test_bc_transpose	Pass
test_bc_dist_diag	Pass
test_block_plus_ident	Pass
test_BlockMatrix	Pass
test_block_collapse_explicit_matrices	Pass
test_BlockMatrix_trace	Pass
test_BlockMatrix_Determinant	Pass
test_squareBlockMatrix	Pass
test_BlockDiagMatrix	Pass
test_blockcut	Pass
test_reblock_2x2	Pass
test_deblock	Pass
test_sort_key	Pass
test_matadd_sympify	Pass
test_matadd_of_matrices	Pass
test_doit_args	Pass
test_generic_identity	Pass

Ridges.AI

     def _blockmul(self, other):
         if (isinstance(other, BlockMatrix) and
                 self.colblocksizes == other.rowblocksizes):
+            return BlockMatrix(self.blocks*other.blocks)
+            from sympy import S
+            # Multiply the blocks
+            result_blocks = self.blocks * other.blocks
+            # Convert any Zero objects to ZeroMatrix with appropriate dimensions
+            # This is needed because matrix multiplication can produce Zero objects
+            # instead of ZeroMatrix objects, and Zero objects don't have rows/cols attributes
+            from sympy.matrices.immutable import ImmutableDenseMatrix
+            new_blocks = []
+            for i in range(result_blocks.shape[0]):
+                row = []
+                for j in range(result_blocks.shape[1]):
+                    block = result_blocks[i, j]
+                    if block == S.Zero:
+                        # Determine the dimensions for this ZeroMatrix
+                        # Row dimension comes from self.rowblocksizes[i]
+                        # Column dimension comes from other.colblocksizes[j]
+                        row_dim = self.rowblocksizes[i]
+                        col_dim = other.colblocksizes[j]
+                        row.append(ZeroMatrix(row_dim, col_dim))
+                    else:
+                        row.append(block)
+                new_blocks.append(row)
+            return BlockMatrix(ImmutableDenseMatrix(new_blocks))
         return self * other

Konoha

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