Add constant segment to export_program for tests (#1493)

Summary:
Pull Request resolved: #1493

- add `extract_constant_segment` to export_program
- for each program, generate pte file with constants in segment, and constants in flatbuffer.

Reviewed By: dbort

Differential Revision: D52434374

fbshipit-source-id: 4a387c6ad46b88723f1865b16558f20e226aff0f

Author: lucylq

test/end2end/exported_module.py

@@ -63,6 +63,7 @@ def export(
         ignore_to_out_var_failure: bool = False,
         dynamic_memory_planning_mode: DynamicMemoryPlanningMode = DynamicMemoryPlanningMode.UPPER_BOUND,
         capture_config=None,
+        extract_constant_segment: bool = True,
     ) -> "ExportedModule":
         """
         Creates a new ExportedModule for the specified module class.
@@ -166,6 +167,7 @@ def return_wrapper():
                     dynamic_memory_planning_mode=dynamic_memory_planning_mode,
                     memory_planning_pass=memory_planning_pass,
                     to_out_var_pass=ToOutVarPass(ignore_to_out_var_failure),
+                    extract_constant_segment=extract_constant_segment,
                 )
             )
         )

test/models/export_program.py

@@ -155,7 +155,9 @@ def get_method_names_to_export() -> List[str]:
 #
 
 
-def export_module_to_program(module_class: Type[nn.Module]):
+def export_module_to_program(
+    module_class: Type[nn.Module], extract_constant_segment: bool
+):
     """Exports the module and returns the serialized program data."""
     # Look for an optional @staticmethod that defines custom trace params.
     export_kwargs: Dict[str, Any] = {}
@@ -167,7 +169,12 @@ def export_module_to_program(module_class: Type[nn.Module]):
         methods = module_class.get_method_names_to_export()
     else:
         methods = ["forward"]
-    module = ExportedModule.export(module_class, methods, **export_kwargs)
+    module = ExportedModule.export(
+        module_class,
+        methods,
+        extract_constant_segment=extract_constant_segment,
+        **export_kwargs,
+    )
     return module.executorch_program.buffer
 
 
@@ -205,10 +212,16 @@ def main() -> None:
     # Export and write to the output files.
     os.makedirs(args.outdir, exist_ok=True)
     for module_name, module_class in module_names_to_classes.items():
-        outfile = os.path.join(args.outdir, f"{module_name}.pte")
-        with open(outfile, "wb") as fp:
-            fp.write(export_module_to_program(module_class))
-        print(f"Exported {module_name} and wrote program data to {outfile}")
+        for extract_constant_segment in (True, False):
+            suffix = "" if extract_constant_segment else "-no-constant-segment"
+            outfile = os.path.join(args.outdir, f"{module_name}{suffix}.pte")
+            with open(outfile, "wb") as fp:
+                fp.write(
+                    export_module_to_program(
+                        module_class, extract_constant_segment=extract_constant_segment
+                    )
+                )
+            print(f"Exported {module_name} and wrote program data to {outfile}")
 
 
 if __name__ == "__main__":

test/models/targets.bzl

@@ -72,7 +72,11 @@ def define_common_targets():
     runtime.genrule(
         name = "exported_programs",
         cmd = "$(exe :export_program) --modules " + ",".join(MODULES_TO_EXPORT) + " --outdir $OUT",
-        outs = {fname + ".pte": [fname + ".pte"] for fname in MODULES_TO_EXPORT},
+        outs = {
+            fname + seg_suffix + ".pte": [fname + seg_suffix + ".pte"]
+            for fname in MODULES_TO_EXPORT
+            for seg_suffix in ["", "-no-constant-segment"]
+        },
         default_outs = ["."],
         visibility = [
             "//executorch/...",