Arm backend: Move vgf files to own folder (pytorch#13862)

Follow structure in ethosu folder.

Signed-off-by: Erik Lundell <[email protected]>

Author: Erik-Lundell

backends/arm/TARGETS

@@ -1,3 +1,8 @@
+# Copyright 2025 Arm Limited and/or its affiliates.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
 # @noautodeps
 load("@fbcode_macros//build_defs:python_library.bzl", "python_library")
 
@@ -12,6 +17,17 @@ python_library(
         ":arm_partitioner",
     ]
 )
+python_library(
+    name = "vgf_partitioner",
+    srcs = [
+        "vgf/__init__.py",
+        "vgf/backend.py",
+        "vgf/partitioner.py"
+    ],
+    deps = [
+        ":arm_partitioner",
+    ]
+)
 python_library(
     name = "constants",
     srcs = [
@@ -39,8 +55,6 @@ python_library(
     srcs = [
         "tosa/backend.py",
         "tosa/partitioner.py",
-        "vgf_backend.py",
-        "vgf_partitioner.py",
     ],
     deps = [
         ":arm_backend",

backends/arm/test/misc/test_extract_io_params_tosa.py

@@ -17,7 +17,7 @@
 from executorch.backends.arm.test.common import SkipIfNoModelConverter
 from executorch.backends.arm.tosa import TosaSpecification
 from executorch.backends.arm.tosa.partitioner import TOSAPartitioner
-from executorch.backends.arm.vgf_partitioner import VgfPartitioner
+from executorch.backends.arm.vgf import VgfPartitioner
 from executorch.exir import to_edge_transform_and_lower
 from executorch.exir.passes.quantize_io_pass import extract_io_quant_params
 from torchao.quantization.pt2e.quantize_pt2e import convert_pt2e, prepare_pt2e

backends/arm/test/tester/arm_tester.py

@@ -63,7 +63,7 @@
 from executorch.backends.arm.tosa.partitioner import TOSAPartitioner
 from executorch.backends.arm.tosa.specification import get_tosa_spec
 
-from executorch.backends.arm.vgf_partitioner import VgfPartitioner
+from executorch.backends.arm.vgf import VgfPartitioner
 
 from executorch.backends.test.harness.stages import Stage, StageType
 from executorch.backends.xnnpack.test.tester import Tester

backends/arm/vgf/__init__.py

@@ -0,0 +1,14 @@
+# Copyright 2025 Arm Limited and/or its affiliates.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+#
+# pyre-unsafe
+
+from .backend import VgfBackend  # noqa: F401
+from .partitioner import VgfPartitioner  # noqa: F401
+
+__all__ = [
+    "VgfBackend",
+    "VgfPartitioner",
+]

backends/arm/vgf_backend.py renamed to backends/arm/vgf/backend.py

@@ -11,7 +11,7 @@
     is_vgf,
 )  # usort: skip
 from executorch.backends.arm.tosa.partitioner import TOSAPartitioner
-from executorch.backends.arm.vgf_backend import VgfBackend
+from executorch.backends.arm.vgf import VgfBackend
 from executorch.exir.backend.compile_spec_schema import CompileSpec
 from executorch.exir.backend.partitioner import DelegationSpec
 from torch.fx.passes.operator_support import OperatorSupportBase

backends/arm/vgf_partitioner.py renamed to backends/arm/vgf/partitioner.py

@@ -40,7 +40,7 @@
     MobileNetV2Evaluator,
 )
 
-from executorch.backends.arm.vgf_partitioner import VgfPartitioner
+from executorch.backends.arm.vgf import VgfPartitioner
 
 # To use Cortex-M backend
 from executorch.backends.cortex_m.passes.quantized_op_fusion_pass import (

examples/arm/aot_arm_compiler.py

@@ -181,7 +181,7 @@
    "outputs": [],
    "source": [
     "import os\n",
-    "from executorch.backends.arm.vgf_partitioner import VgfPartitioner\n",
+    "from executorch.backends.arm.vgf import VgfPartitioner\n",
     "from executorch.exir import (\n",
     "    EdgeCompileConfig,\n",
     "    ExecutorchBackendConfig,\n",