[tools/mec] Add namespace to operator

It adds a namespace to the operator node based on the name of its
output tensor. It helps to graph folded with grouping of operators
that uses same namespace.

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

tools/model_explorer_circle/src/circle_adapter/main.py

@@ -104,8 +104,17 @@ def build_graph(self, me_graph: graph_builder.Graph) -> None:
         for idx, op in enumerate(sub_graph.operators):
             name = self.opcode_to_name(
                 self.model.operatorCodes[op.opcodeIndex].builtinCode)
-            me_node = graph_builder.GraphNode(id=f'{idx}', label=name)
+            # Construct namespace following output tensor's name
+            output_tensor_id = op.outputs[0]
+            output_tensor = sub_graph.tensors[output_tensor_id]
+            ns = output_tensor.name.decode("utf-8")
+            if '/' in ns:
+                # Let's take maximum 2 depths of the tensor name
+                # '/A/B/C/D' becomes 'A/B'
+                ns = '/'.join(ns.strip('/').split('/')[:2])
+            me_node = graph_builder.GraphNode(id=f'{idx}', label=name, namespace=ns)
             me_graph.nodes.append(me_node)
+
             # Connect edges from inputs to this operator node
             for i, tensor_id in enumerate(op.inputs):
                 if tensor_id < 0: