[tools/mec] Show real operator name of custom op

It fixes to show real operator name of custom op node.

ONE-DCO-1.0-Signed-off-by: Jonghwa Lee <[email protected]>

tools/model_explorer_circle/src/model_explorer_circle/main.py

@@ -56,6 +56,8 @@ def load_model(self, model_path: str) -> None:
     def get_opcode_name(self, opcode_index: int) -> str:
         """Convert the opcode to its name."""
         opcode = self.model.operatorCodes[opcode_index].deprecatedBuiltinCode
+        if opcode == circle_schema.BuiltinOperator.CUSTOM:
+            return self.model.operatorCodes[opcode_index].customCode.decode('utf-8')
         if opcode == circle_schema.BuiltinOperator.PLACEHOLDER_FOR_GREATER_OP_CODES:
             opcode = self.model.operatorCodes[opcode_index].builtinCode
             assert (opcode >= 127)