1 files changed, 7 insertions, 7 deletions
diff --git a/src/mlia/nn/rewrite/core/graph_edit/join.py b/src/mlia/nn/rewrite/core/graph_edit/join.py
index 14a7347..2530ec8 100644
--- a/src/mlia/nn/rewrite/core/graph_edit/join.py
+++ b/src/mlia/nn/rewrite/core/graph_edit/join.py
@@ -22,8 +22,8 @@ def join_models(
     input_src: str | Path,
     input_dst: str | Path,
     output_file: str | Path,
-    subgraph_src: SubGraphT = 0,
-    subgraph_dst: SubGraphT = 0,
+    subgraph_src: int = 0,
+    subgraph_dst: int = 0,
 ) -> None:
     """Join two models and save the result into a given model file path."""
     src_model = load(input_src)
@@ -150,12 +150,12 @@ def join_subgraphs(
     dst_subgraph.outputs = list(set(src_subgraph.outputs).union(dst_subgraph.outputs))
 
 
-def append_relabel(src: list, dst: list, operator_map: dict | None = None) -> dict:
-    """Return a map over relabeled tensors in a subgraph."""
-    if not operator_map:
-        operator_map = {}
+def append_relabel(src: list, dst: list, operator_map: dict) -> None:
+    """Update the operator map over relabeled tensors in a subgraph."""
+    if operator_map is None:
+        raise ValueError("The input operator map cannot be None!")
+
     for i, x in enumerate(src):  # pylint: disable=invalid-name
         if i not in operator_map:
             operator_map[i] = len(dst)
             dst.append(x)
-    return operator_map