[ExecuTorch] Arm Ethos: Add pass tests

As title.

Adds pytest.test_option["tosa_ref_model"] similar to "corestone_fvp". This is a hack. Once we buckify the reference model, we should remove this. It shouldn't have impact on the OSS test coverage.

Differential Revision: [D69714010](https://our.internmc.facebook.com/intern/diff/D69714010/)

ghstack-source-id: 266705920
Pull Request resolved: #8561

Author: digantdesai

backends/arm/test/TARGETS

@@ -1,4 +1,8 @@
 load("@fbcode_macros//build_defs:python_library.bzl", "python_library")
+load(":targets.bzl", "define_arm_tests")
+
+
+oncall("executorch")
 
 python_library(
     name = "common",
@@ -8,6 +12,7 @@ python_library(
         "//executorch/backends/arm:arm_backend",
         "//executorch/exir:lib",
         "//executorch/exir/backend:compile_spec_schema",
+        "fbsource//third-party/pypi/pytest:pytest",
     ]
 )
 
@@ -40,7 +45,10 @@ python_library(
         "//executorch/backends/arm:tosa_mapping",
         "//executorch/backends/arm:tosa_specification",
         "//executorch/backends/arm/quantizer:arm_quantizer",
+        "//executorch/backends/arm:arm_partitioner",
         "//executorch/devtools/backend_debug:delegation_info",
         "fbsource//third-party/pypi/tabulate:tabulate",
     ]
 )
+
+define_arm_tests() 

backends/arm/test/conftest.py

@@ -13,7 +13,13 @@
 from typing import Any
 
 import pytest
-import torch
+import logging
+
+try:
+    import tosa_reference_model
+except ImportError:
+    logging.warning("tosa_reference_model not found, can't run reference model tests")
+    tosa_reference_model = None
 
 """
 This file contains the pytest hooks, fixtures etc. for the Arm test suite.
@@ -24,18 +30,29 @@
 
 
 def pytest_configure(config):
-
     pytest._test_options = {}  # type: ignore[attr-defined]
-
-    if config.option.arm_run_corstoneFVP:
+    pytest._test_options["corstone_fvp"] = False  # type: ignore[attr-defined]
+    if (
+        getattr(config.option, "arm_run_corestoneFVP", False)
+        and config.option.arm_run_corstoneFVP
+    ):
         corstone300_exists = shutil.which("FVP_Corstone_SSE-300_Ethos-U55")
         corstone320_exists = shutil.which("FVP_Corstone_SSE-320")
         if not (corstone300_exists and corstone320_exists):
             raise RuntimeError(
                 "Tests are run with --arm_run_corstoneFVP but corstone FVP is not installed."
             )
-        pytest._test_options["corstone_fvp"] = True  # type: ignore[attr-defined]
-    pytest._test_options["fast_fvp"] = config.option.fast_fvp  # type: ignore[attr-defined]
+        # Only enable if we also have the TOSA reference model available.
+        pytest._test_options["corstone_fvp"] = tosa_reference_model is not None  # type: ignore[attr-defined]
+
+    pytest._test_options["fast_fvp"] = False  # type: ignore[attr-defined]
+    if getattr(config.option, "fast_fvp", False):
+        pytest._test_options["fast_fvp"] = config.option.fast_fvp  # type: ignore[attr-defined]
+
+    # TODO: remove this flag once we have a way to run the reference model tests with Buck
+    pytest._test_options["tosa_ref_model"] = False  # type: ignore[attr-defined]
+    if tosa_reference_model is not None:
+        pytest._test_options["tosa_ref_model"] = True  # type: ignore[attr-defined]
     logging.basicConfig(level=logging.INFO, stream=sys.stdout)
 
 
@@ -44,9 +61,15 @@ def pytest_collection_modifyitems(config, items):
 
 
 def pytest_addoption(parser):
-    parser.addoption("--arm_quantize_io", action="store_true", help="Deprecated.")
-    parser.addoption("--arm_run_corstoneFVP", action="store_true")
-    parser.addoption("--fast_fvp", action="store_true")
+    def try_addoption(*args, **kwargs):
+        try:
+            parser.addoption(*args, **kwargs)
+        except Exception:
+            pass
+
+    try_addoption("--arm_quantize_io", action="store_true", help="Deprecated.")
+    try_addoption("--arm_run_corstoneFVP", action="store_true", help="Deprecated.")
+    try_addoption("--fast_fvp", action="store_true")
 
 
 def pytest_sessionstart(session):
@@ -78,6 +101,8 @@ def set_random_seed():
     Rerun with a specific seed found under a random seed test
         ARM_TEST_SEED=3478246 pytest --config-file=/dev/null --verbose -s --color=yes  backends/arm/test/ops/test_avg_pool.py -k <TESTCASE>
     """
+    import torch
+
     if os.environ.get("ARM_TEST_SEED", "RANDOM") == "RANDOM":
         random.seed()  # reset seed, in case any other test has fiddled with it
         seed = random.randint(0, 2**32 - 1)
@@ -161,6 +186,8 @@ def _load_libquantized_ops_aot_lib():
     res = subprocess.run(find_lib_cmd, capture_output=True)
     if res.returncode == 0:
         library_path = res.stdout.decode().strip()
+        import torch
+
         torch.ops.load_library(library_path)
     else:
         raise RuntimeError(

backends/arm/test/passes/test_rescale_pass.py

@@ -116,7 +116,7 @@ def _test_rescale_pipeline(
 ):
     """Tests a model with many ops that requires rescales. As more ops are quantized to int32 and
     need the InsertRescalesPass, make sure that they play nicely together."""
-    (
+    tester = (
         ArmTester(
             module,
             example_inputs=test_data,
@@ -126,8 +126,9 @@ def _test_rescale_pipeline(
         .export()
         .to_edge_transform_and_lower()
         .to_executorch()
-        .run_method_and_compare_outputs(test_data)
     )
+    if conftest.is_option_enabled("tosa_ref_model"):
+        tester.run_method_and_compare_outputs(test_data)
 
 
 def _test_rescale_pipeline_ethosu(
@@ -152,6 +153,7 @@ def _test_rescale_pipeline_ethosu(
 class TestRescales(unittest.TestCase):
 
     @parameterized.expand(RescaleNetwork.test_parameters)
+    @pytest.mark.tosa_ref_model
     def test_quantized_rescale(self, x, y):
         _test_rescale_pipeline(RescaleNetwork(), (x, y))
 

backends/arm/test/pytest.ini

@@ -2,4 +2,5 @@
 addopts = --strict-markers
 markers =
     slow: Tests that take long time
-    corstone_fvp: Tests that use Corstone300 or Corstone320 FVP
+    corstone_fvp: Tests that use Corstone300 or Corstone320 FVP # And also uses TOSA reference model
+    tosa_ref_model: Tests that use TOSA reference model # Temporary!

backends/arm/test/runner_utils.py

@@ -22,7 +22,6 @@
 try:
     import tosa_reference_model
 except ImportError:
-    logger.warning("tosa_reference_model not found, can't run reference model tests")
     tosa_reference_model = None
 from executorch.backends.arm.arm_backend import get_tosa_spec, is_tosa
 

backends/arm/test/targets.bzl

@@ -0,0 +1,30 @@
+load("//caffe2/test/fb:defs.bzl", "define_tests")
+load("@bazel_skylib//lib:paths.bzl", "paths")
+
+def define_arm_tests():
+    # TODO Add more tests
+    test_files = native.glob(["passes/test_*.py"])
+
+    TESTS = {}
+
+    for test_file in test_files:
+        test_file_name = paths.basename(test_file)
+        test_name = test_file_name.replace("test_", "").replace(".py", "")
+        TESTS[test_name] = [test_file]
+
+    define_tests(
+        pytest = True,
+        tests = TESTS,
+        pytest_config = "pytest.ini",
+        resources = ["conftest.py"],
+        preload_deps = [
+            "//executorch/kernels/quantized:custom_ops_generated_lib",
+        ],
+        deps = [
+            ":arm_tester",
+            ":conftest",
+            "//executorch/exir:lib",
+            "fbsource//third-party/pypi/pytest:pytest",
+            "fbsource//third-party/pypi/parameterized:parameterized",
+        ],
+    )