Do relabeling on graph copies

nncf/common/utils/dot_file_rw.py

@@ -8,7 +8,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+import copy
 import pathlib
 from collections import defaultdict
 
@@ -52,6 +52,8 @@ def relabel_graph_for_dot_visualization(nx_graph: nx.Graph, from_reference: bool
     :return: NetworkX graph with reserved symbols in nodes keys replaced.
     """
 
+    nx_graph = copy.deepcopy(nx_graph)
+
     # .dot format reserves ':' character in node names
     if not from_reference:
         # dumping to disk