fix rename_placeholder

Author: TelGome

graph_net/torch/fx_graph_parse_util.py

@@ -116,8 +116,8 @@ def _rename_placeholder(name, pattern2replacement):
     if not (name[:2] == "L_" or name[:2] == "l_"):
         return name
     name = name[2:]
-    if name[0] == "l":
-        name = "L" + name[1:]
+    if name[:2] == "l_":
+        name = "L_" + name[2:]
     for pattern, replacement in pattern2replacement.items():
         name = name.replace(pattern, replacement)
     return name