pytorch · JakeStevens · Aug 12, 2026 · Aug 13, 2026
@@ -2,6 +2,9 @@
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
+"""Pytest hooks and fixtures for the Arm test suite."""
+
+from __future__ import annotations
 
 import logging
 import os
@@ -11,9 +14,7 @@
 
 import pytest
 
-"""
-This file contains the pytest hooks, fixtures etc. for the Arm test suite.
-"""
+logger: logging.Logger = logging.getLogger(__name__)
 
 
 # ==== Pytest hooks ====
@@ -41,8 +42,53 @@ def pytest_report_header(config):
     return config._test_seed_label
 
 
+def _mark_rife_vgf_xfails_for_model_converter_below_minimum_version(
+    items, reason: str
+) -> None:
+    for item in items:
+        nodeid = item.nodeid.lower()
+        if "test_rife.py" not in nodeid or "vgf_quant" not in nodeid:
+            continue
+        item.add_marker(pytest.mark.xfail(reason=reason, strict=False))
+
+
+def _has_rife_vgf_quant_tests(items) -> bool:
+    return any(
+        "test_rife.py" in item.nodeid.lower() and "vgf_quant" in item.nodeid.lower()
+        for item in items
+    )
+
+
 def pytest_collection_modifyitems(config, items):
-    pass
+    if not _has_rife_vgf_quant_tests(items):
+        return
+
+    try:
+        from executorch.backends.arm.vgf.model_converter import (
+            get_model_converter_minimum_version_failure_reason,
+            get_model_converter_version_text,
+            MIN_MODEL_CONVERTER_VERSION_FOR_VGF_TESTS,
+        )
+    except Exception:
+        logger.warning(
+            "Could not import the model-converter version helpers; leaving the "
+            "RIFE VGF quant tests unmarked.",
+            exc_info=True,
+        )
+        return
+
+    version_text = get_model_converter_version_text()
+    if version_text is None:
+        return
+
+    reason = get_model_converter_minimum_version_failure_reason(
+        version_text,
+        MIN_MODEL_CONVERTER_VERSION_FOR_VGF_TESTS,
+        requirement_name="the copied RIFE VGF quant tests",
+    )
+    if reason is None:
+        return
+    _mark_rife_vgf_xfails_for_model_converter_below_minimum_version(items, reason)
 
 
 def pytest_addoption(parser):
@@ -127,7 +173,6 @@ def is_option_enabled(option: str, fail_if_not_enabled: bool = False) -> bool:
     RuntimeError instead of returning False.
 
     """
-
     if hasattr(pytest, "_test_options") and option in pytest._test_options and pytest._test_options[option]:  # type: ignore[attr-defined]
         return True
     else:

@@ -7,11 +7,13 @@
 
 import stat
 from pathlib import Path
+from typing import Any
 
 import executorch.backends.arm.vgf.check_env as check_env
 import executorch.backends.arm.vgf.model_converter as model_converter
 
 import pytest
+from executorch.backends.arm.test import conftest as arm_conftest
 from executorch.backends.arm.vgf import backend as vgf_backend
 from executorch.backends.arm.vgf.compile_spec import VgfCompileSpec
 
@@ -151,6 +153,137 @@ def test_model_converter_check_reports_version(monkeypatch, tmp_path):
     assert "0.9.0" in result.detail
 
 
+def test_get_model_converter_version_text(monkeypatch, tmp_path):
+    converter = _make_executable(
+        tmp_path / "model-converter",
+        "#!/usr/bin/env python3\n"
+        "import sys\n"
+        "if '--version' in sys.argv:\n"
+        "    print('model-converter d8c1b8e')\n"
+        "    raise SystemExit(0)\n"
+        "raise SystemExit(1)\n",
+    )
+    monkeypatch.setattr(
+        model_converter, "find_model_converter_binary", lambda: str(converter)
+    )
+
+    assert model_converter.get_model_converter_version_text() == (
+        "model-converter d8c1b8e"
+    )
+
+
+def test_parse_model_converter_version_uses_known_build_alias(monkeypatch, tmp_path):
+    converter = _make_executable(
+        tmp_path / "model-converter",
+        "#!/usr/bin/env python3\n"
+        "import sys\n"
+        "if '--version' in sys.argv:\n"
+        "    print('model-converter d8c1b8e')\n"
+        "    raise SystemExit(0)\n"
+        "raise SystemExit(1)\n",
+    )
+    monkeypatch.setattr(
+        model_converter, "find_model_converter_binary", lambda: str(converter)
+    )
+
+    version_text = model_converter.get_model_converter_version_text()
+
+    assert version_text is not None
+    assert model_converter.parse_model_converter_version(version_text) == (
+        model_converter.Version("0.9.0")
+    )
+
+
+def test_below_minimum_model_converter_reason(monkeypatch, tmp_path):
+    converter = _make_executable(
+        tmp_path / "model-converter",
+        "#!/usr/bin/env python3\n"
+        "import sys\n"
+        "if '--version' in sys.argv:\n"
+        "    print('model-converter d8c1b8e')\n"
+        "    raise SystemExit(0)\n"
+        "raise SystemExit(1)\n",
+    )
+    monkeypatch.setattr(
+        model_converter, "find_model_converter_binary", lambda: str(converter)
+    )
+
+    version_text = model_converter.get_model_converter_version_text()
+
+    assert version_text is not None
+    assert model_converter.get_model_converter_minimum_version_failure_reason(
+        version_text,
+        model_converter.MIN_MODEL_CONVERTER_VERSION_FOR_VGF_TESTS,
+        requirement_name="the copied RIFE VGF quant tests",
+    ) == (
+        "model-converter d8c1b8e is below the minimum supported version "
+        "0.10.0 required for the copied RIFE VGF quant tests"
+    )
+
+
+def test_mark_rife_vgf_xfails_marks_only_rife_vgf_quant():
+    class DummyItem:
+        def __init__(self, nodeid: str):
+            self.nodeid = nodeid
+            self.markers: list[Any] = []
+
+        def add_marker(self, marker: Any) -> None:
+            self.markers.append(marker)
+
+    matching = DummyItem("backends/arm/test/models/test_RIFE.py::test_vgf_quant")
+    non_matching = DummyItem("backends/arm/test/models/test_RIFE.py::test_tosa")
+
+    arm_conftest._mark_rife_vgf_xfails_for_model_converter_below_minimum_version(
+        [matching, non_matching], "below minimum version"
+    )
+
+    assert len(matching.markers) == 1
+    assert matching.markers[0].name == "xfail"
+    assert not non_matching.markers
+
+
+def test_has_rife_vgf_quant_tests_matches_only_rife_vgf_quant():
+    class DummyItem:
+        __slots__ = ("nodeid",)
+
+        def __init__(self, nodeid: str):
+            self.nodeid = nodeid
+
+    assert arm_conftest._has_rife_vgf_quant_tests(
+        [
+            DummyItem("backends/arm/test/models/test_RIFE.py::test_tosa"),
+            DummyItem("backends/arm/test/models/test_RIFE.py::test_vgf_quant"),
+        ]
+    )
+    assert not arm_conftest._has_rife_vgf_quant_tests(
+        [
+            DummyItem("backends/arm/test/models/test_RIFE.py::test_tosa"),
+            DummyItem("backends/arm/test/ops/test_add.py::test_basic"),
+        ]
+    )
+
+
+def test_collection_hook_skips_converter_probe_when_no_rife_vgf_quant(monkeypatch):
+    class DummyItem:
+        __slots__ = ("nodeid",)
+
+        def __init__(self, nodeid: str):
+            self.nodeid = nodeid
+
+    def fail_probe():
+        raise AssertionError("converter probe should not run")
+
+    monkeypatch.setattr(model_converter, "get_model_converter_version_text", fail_probe)
+
+    arm_conftest.pytest_collection_modifyitems(
+        None,
+        [
+            DummyItem("backends/arm/test/models/test_RIFE.py::test_tosa"),
+            DummyItem("backends/arm/test/ops/test_add.py::test_basic"),
+        ],
+    )
+
+
 def test_model_converter_lib_dir_fails_when_invalid(monkeypatch, tmp_path):
     missing = tmp_path / "missing"
     monkeypatch.setenv("MODEL_CONVERTER_LIB_DIR", str(missing))

@@ -42,8 +42,10 @@
 )
 from executorch.backends.arm.vgf import VgfCompileSpec, VgfPartitioner
 from executorch.backends.arm.vgf.model_converter import (
-    find_model_converter_binary,
-    model_converter_env,
+    get_model_converter_minimum_version_failure_reason,
+    get_model_converter_version_text,
+    MIN_MODEL_CONVERTER_VERSION_FOR_VGF_TESTS,
+    parse_model_converter_version,
 )
 from executorch.exir import EdgeCompileConfig, to_edge_transform_and_lower
 from executorch.exir.pass_base import ExportPass
@@ -67,60 +69,37 @@ def ensure_glslc() -> None:
 
 
 @functools.lru_cache(maxsize=1)
-def _model_converter_is_legacy_release() -> tuple[bool, str]:
-    model_converter = find_model_converter_binary()
-    if model_converter is None:
+def _model_converter_supports_vgf_tests() -> tuple[bool, str]:
+    version_text = get_model_converter_version_text()
+    if version_text is None:
         warnings.warn(
             "Could not find model-converter while evaluating the VGF runtime "
-            "legacy-version xfail gate; assuming a newer/custom build.",
+            "minimum-version xfail gate; assuming a newer/custom build.",
             stacklevel=2,
         )
-        return False, ""
+        return True, ""
 
-    try:
-        result = subprocess.run(  # nosec B603 - trusted local tool
-            [model_converter, "--version"],
-            check=True,
-            capture_output=True,
-            text=True,
-            env=model_converter_env(),
-        )
-    except Exception as exc:
-        warnings.warn(
-            "Failed to query model-converter --version while evaluating the VGF "
-            f"runtime legacy-version xfail gate ({exc}); assuming a newer/custom "
-            "build.",
-            stacklevel=2,
-        )
-        return False, ""
+    reason = get_model_converter_minimum_version_failure_reason(
+        version_text,
+        MIN_MODEL_CONVERTER_VERSION_FOR_VGF_TESTS,
+        requirement_name="these VGF runtime tests",
+    )
+    if reason is not None:
+        return False, reason
 
-    version_text = (result.stdout or result.stderr).strip()
-    if not version_text:
+    if parse_model_converter_version(version_text) is None:
         warnings.warn(
-            "model-converter --version returned no output while evaluating the VGF "
-            "runtime legacy-version xfail gate; assuming a newer/custom build.",
+            "Could not map model-converter version output to a comparable "
+            f"release while evaluating the VGF runtime minimum-version xfail "
+            f"gate; detected {version_text!r}. Assuming a newer/custom build.",
             stacklevel=2,
         )
-        return False, ""
-
-    if "d8c1b8e" in version_text:
-        return (
-            True,
-            "released model-converter build d8c1b8e predates required VGF custom "
-            "shader features; use a newer source build",
-        )
-
-    warnings.warn(
-        "model-converter legacy-version xfail gate expected d8c1b8e; detected "
-        f"{version_text!r}. Assuming a newer/custom build.",
-        stacklevel=2,
-    )
-    return False, ""
+    return True, ""
 
 
-def xfail_if_legacy_model_converter_release() -> pytest.MarkDecorator:
-    is_legacy_release, reason = _model_converter_is_legacy_release()
-    return pytest.mark.xfail(is_legacy_release, reason=reason, strict=False)
+def xfail_if_model_converter_below_minimum_version() -> pytest.MarkDecorator:
+    supports_vgf_tests, reason = _model_converter_supports_vgf_tests()
+    return pytest.mark.xfail(not supports_vgf_tests, reason=reason, strict=False)
 
 
 def find_single_vgf_json(output_dir: Path) -> Path:

@@ -16,11 +16,11 @@
     lower_sampler_vgf,
     lower_threes_vgf,
     make_sampler_probe_inputs,
-    xfail_if_legacy_model_converter_release,
+    xfail_if_model_converter_below_minimum_version,
 )
 from executorch.backends.arm.test import common
 
-pytestmark = xfail_if_legacy_model_converter_release()
+pytestmark = xfail_if_model_converter_below_minimum_version()
 
 
 class _ThreesModule(torch.nn.Module):

@@ -18,11 +18,11 @@
     lower_threes_vgf,
     make_sampler_probe_inputs,
     segment_types,
-    xfail_if_legacy_model_converter_release,
+    xfail_if_model_converter_below_minimum_version,
 )
 from executorch.backends.arm.test import common
 
-pytestmark = xfail_if_legacy_model_converter_release()
+pytestmark = xfail_if_model_converter_below_minimum_version()
 
 
 def _has_alias_pair(vgf_json: dict, lhs: str, rhs: str) -> bool:

@@ -17,11 +17,11 @@
     make_identity_grid,
     make_input_tensor,
     make_sampler_probe_inputs,
-    xfail_if_legacy_model_converter_release,
+    xfail_if_model_converter_below_minimum_version,
 )
 from executorch.backends.arm.test import common
 
-pytestmark = xfail_if_legacy_model_converter_release()
+pytestmark = xfail_if_model_converter_below_minimum_version()
 
 
 class _GraphThenShader(torch.nn.Module):

@@ -16,11 +16,11 @@
     make_identity_grid,
     make_input_tensor,
     make_sampler_probe_inputs,
-    xfail_if_legacy_model_converter_release,
+    xfail_if_model_converter_below_minimum_version,
 )
 from executorch.backends.arm.test import common
 
-pytestmark = xfail_if_legacy_model_converter_release()
+pytestmark = xfail_if_model_converter_below_minimum_version()
 
 
 class _IdentitySampler(torch.nn.Module):

@@ -18,11 +18,11 @@
     lower_in_tree_vgf,
     make_identity_grid,
     make_input_tensor,
-    xfail_if_legacy_model_converter_release,
+    xfail_if_model_converter_below_minimum_version,
 )
 from executorch.backends.arm.test import common
 
-pytestmark = xfail_if_legacy_model_converter_release()
+pytestmark = xfail_if_model_converter_below_minimum_version()
 
 
 class _IdentityGridSample(torch.nn.Module):