Hook up PreprocessAll flow to EdgeManager

exir/backend/backend_api.py

@@ -238,7 +238,6 @@ def generate_debug_handle(ep: ExportedProgram) -> int:
         call_delegate_node.meta["val"] = submodule_output_node.meta["val"]
         call_submodule_node.replace_all_uses_with(call_delegate_node)
         owning_graph_module.graph.erase_node(call_submodule_node)
-
     if is_submodule:
         assert len(toplevel_input_specs_to_delete) == 0
         assert len(toplevel_output_specs_to_delete) == 0
@@ -574,26 +573,29 @@ def lower_all_submodules_to_backend(
     # The created exported program for the submodules are in the call_module node's meta data
     # We just map the method_to_submodule_nodes directly to the method_to_partitioned_exported_programs
     method_to_partitioned_program = {
-        method_name: [node.meta["submodule_program"] for node in call_submodule_nodes]
+        method_name: [
+            copy.deepcopy(node.meta["submodule_program"])
+            for node in call_submodule_nodes
+        ]
         for method_name, call_submodule_nodes in method_to_submodules_nodes.items()
     }
     method_to_compile_specs = {
         method_name: [node.meta["compile_spec"] for node in call_submodule_nodes]
         for method_name, call_submodule_nodes in method_to_submodules_nodes.items()
     }
-    backend_found = False
-    for cls in BackendDetails.__subclasses__():
-        if backend_id == cls.__name__:
-            method_to_preprocess_result: dict[str, List[PreprocessResult]] = (
-                cls.preprocess_multimethod(
-                    method_to_partitioned_program, method_to_compile_specs
-                )
-            )
-            backend_found = True
 
-    if not backend_found:
+    backend_name_to_subclass = {
+        subclass.__name__: subclass for subclass in BackendDetails.__subclasses__()
+    }
+    if backend_id not in backend_name_to_subclass:
         raise NotImplementedError(f"Backend {backend_id} was not found.")
 
+    method_to_preprocess_result: dict[str, List[PreprocessResult]] = (
+        backend_name_to_subclass[backend_id].preprocess_multimethod(
+            method_to_partitioned_program, method_to_compile_specs
+        )
+    )
+
     for method_name in method_to_preprocess_result.keys():
         owning_program = method_to_tagged_edge_program[method_name]
         list_of_preprocess_results = method_to_preprocess_result[method_name]
@@ -612,6 +614,9 @@ def lower_all_submodules_to_backend(
                 compile_specs=compile_spec,
                 named_data_store_output=preprocess_result.data_store_output,
             )
+            lowered_module.meta = {
+                "debug_handle_map": preprocess_result.debug_handle_map,
+            }
             is_submodule = call_submodule_node.meta["is_submodule"]
             toplevel_input_specs_to_delete = call_submodule_node.meta[
                 "toplevel_input_specs_to_delete"
@@ -633,6 +638,20 @@ def lower_all_submodules_to_backend(
             )
 
 
+def remove_used_metadata(graph: torch.fx.Graph) -> None:
+    """
+    Remove the used metadata from the graph.
+    """
+    for node in graph.nodes:
+        node.meta.pop("delegation_tag", None)
+        node.meta.pop("backend_id", None)
+        node.meta.pop("submodule_program", None)
+        node.meta.pop("toplevel_input_specs_to_delete", None)
+        node.meta.pop("toplevel_output_specs_to_delete", None)
+        node.meta.pop("is_submodule", None)
+        node.meta.pop("submodule_output_node", None)
+
+
 @dataclass
 class MethodProgramsPartitionerSpec:
     """
@@ -748,6 +767,7 @@ def to_backend(
         if method_name in method_to_tagged_exported_program:
             tagged_exported_program = method_to_tagged_exported_program[method_name]
             tagged_exported_program._validate()
+            remove_used_metadata(tagged_exported_program.graph_module.graph)
             partitioned_and_lowered_exported_programs[method_name] = ExportedProgram(
                 root=tagged_exported_program.graph_module,
                 graph=tagged_exported_program.graph_module.graph,

exir/program/_program.py

@@ -23,7 +23,10 @@
 from executorch.exir._serialize._serialize import serialize_for_executorch
 from executorch.exir._serialize.data_serializer import DataSerializer
 from executorch.exir._warnings import experimental
-from executorch.exir.backend.backend_api import to_backend
+from executorch.exir.backend.backend_api import (
+    MethodProgramsPartitionerSpec,
+    to_backend,
+)
 from executorch.exir.backend.partitioner import Partitioner
 from executorch.exir.capture._config import EdgeCompileConfig, ExecutorchBackendConfig
 from executorch.exir.delegate import executorch_call_delegate, is_lowered_module
@@ -1239,10 +1242,16 @@ def to_edge_transform_and_lower(
     if transform_passes is not None:
         edge_manager = edge_manager.transform(transform_passes)
 
-    if partitioner is not None:
+    max_num_partitioners = 0
+    for partitioner_list in partitioner.values():
+        max_num_partitioners = max(max_num_partitioners, len(partitioner_list))
+
+    for i in range(max_num_partitioners):
+        method_to_partitioner = {}
         for name, partitioner_list in partitioner.items():
-            for curr_partitioner in partitioner_list:
-                edge_manager = edge_manager.to_backend({name: curr_partitioner})
+            if i < len(partitioner_list):
+                method_to_partitioner[name] = partitioner_list[i]
+        edge_manager = edge_manager.to_backend(method_to_partitioner)
 
     for name, program in edge_manager._edge_programs.items():
         ops_set_to_not_decompose: Set[torch._ops.OpOverload] = set()
@@ -1475,7 +1484,8 @@ def transform(
 
     @et_logger("to_backend")
     def to_backend(
-        self, partitioner: Union[Partitioner, Dict[str, Partitioner]]
+        self,
+        partitioner: Union[Partitioner, Dict[str, Partitioner]],
     ) -> "EdgeProgramManager":
         """
         Returns a semantically-equivalent program to the one given as input,
@@ -1501,17 +1511,18 @@ def to_backend(
             specified subgraphs lowered.
         """
         new_edge_programs: Dict[str, ExportedProgram] = {}
-        if isinstance(partitioner, dict):
-            for name, program in self._edge_programs.items():
-                if name in partitioner.keys():
-                    new_edge_programs[name] = to_backend(program, partitioner[name])
-                else:
-                    new_edge_programs[name] = program
+        method_to_partitioner: Dict[str, Partitioner] = {}
+        if not isinstance(partitioner, dict):
+            method_to_partitioner = {name: partitioner for name in self._edge_programs}
+        else:
+            method_to_partitioner = partitioner
 
-        else:  # apply partitioner to every method
-            for name, program in self._edge_programs.items():
-                new_edge_programs[name] = to_backend(program, partitioner)
+        method_to_programs_and_partitioners = MethodProgramsPartitionerSpec(
+            self._edge_programs,
+            method_to_partitioner,
+        )
 
+        new_edge_programs = to_backend(method_to_programs_and_partitioners)
         config = EdgeCompileConfig(_check_ir_validity=False)
         return EdgeProgramManager(
             new_edge_programs,