Update module call graph for export program builder.

Differential Revision: D77341475

Pull Request resolved: #14038

Author: hsharma35

backends/cadence/aot/program_builder.py

@@ -12,6 +12,7 @@
 from torch import Tensor
 from torch._export.verifier import Verifier
 from torch.export import ExportedProgram
+from torch.export.exported_program import ModuleCallEntry, ModuleCallSignature
 from torch.export.graph_signature import (
     ExportGraphSignature,
     InputKind,
@@ -20,6 +21,7 @@
     OutputSpec,
     TensorArgument,
 )
+from torch.utils import _pytree as pytree
 
 
 class IrMode(Enum):
@@ -87,17 +89,25 @@ def get_verifiers(self) -> Optional[list[Verifier]]:
 
     def get_program(self) -> ExportedProgram:
         gm = self.get_graph_module()
+        graph_signature = ExportGraphSignature(self.input_specs, self.output_specs)
+        in_spec = pytree.tree_flatten((tuple(graph_signature.user_inputs), {}))[1]
+        out_spec = pytree.tree_flatten(graph_signature.user_outputs)[1]
         return ExportedProgram(
             root=gm,
             graph=gm.graph,
-            graph_signature=ExportGraphSignature(
-                input_specs=self.input_specs, output_specs=self.output_specs
-            ),
+            graph_signature=graph_signature,
             # pyre-ignore[6]: Incompatible parameter type.
             constants=self.constants,
             state_dict=self.state_dict,
             range_constraints={},
-            module_call_graph=[],
+            module_call_graph=[
+                ModuleCallEntry(
+                    "",
+                    ModuleCallSignature(
+                        inputs=[], outputs=[], in_spec=in_spec, out_spec=out_spec
+                    ),
+                )
+            ],
             # pyre-ignore[6]: Incompatible parameter type.
             verifiers=self.get_verifiers(),
         )