Re-enable vision MPS builds (#8485)

Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

.github/workflows/build-cmake.yml

@@ -54,7 +54,7 @@ jobs:
         export GPU_ARCH_TYPE=cpu
         export GPU_ARCH_VERSION=''
 
-        ./.github/scripts/cmake.sh
+        ${CONDA_RUN} ./.github/scripts/cmake.sh
 
   windows:
     strategy:

.github/workflows/tests.yml

@@ -68,7 +68,7 @@ jobs:
         export GPU_ARCH_TYPE=cpu
         export GPU_ARCH_VERSION=''
 
-        ./.github/scripts/unittest.sh
+        ${CONDA_RUN} ./.github/scripts/unittest.sh
 
   unittests-windows:
     strategy:

setup.py

@@ -5,7 +5,6 @@
 import shutil
 import subprocess
 import sys
-import warnings
 
 import torch
 from pkg_resources import DistributionNotFound, get_distribution, parse_version
@@ -139,6 +138,7 @@ def get_extensions():
         + glob.glob(os.path.join(extensions_dir, "ops", "cpu", "*.cpp"))
         + glob.glob(os.path.join(extensions_dir, "ops", "quantized", "cpu", "*.cpp"))
     )
+    source_mps = glob.glob(os.path.join(extensions_dir, "ops", "mps", "*.mm"))
 
     print("Compiling extensions with following flags:")
     force_cuda = os.getenv("FORCE_CUDA", "0") == "1"
@@ -204,15 +204,8 @@ def get_extensions():
             define_macros += [("WITH_HIP", None)]
             nvcc_flags = []
         extra_compile_args["nvcc"] = nvcc_flags
-
-    # FIXME: MPS build breaks custom ops registration, so it was disabled.
-    # See https://github.com/pytorch/vision/issues/8456.
-    # TODO: Fix MPS build, remove warning below, and put back commented-out elif block.V
-    if force_mps:
-        warnings.warn("MPS build is temporarily disabled!!!!")
-    # elif torch.backends.mps.is_available() or force_mps:
-    #     source_mps = glob.glob(os.path.join(extensions_dir, "ops", "mps", "*.mm"))
-    #     sources += source_mps
+    elif torch.backends.mps.is_available() or force_mps:
+        sources += source_mps
 
     if sys.platform == "win32":
         define_macros += [("torchvision_EXPORTS", None)]

test/conftest.py

@@ -49,8 +49,7 @@ def pytest_collection_modifyitems(items):
             # There are special cases though, see below
             item.add_marker(pytest.mark.skip(reason=CUDA_NOT_AVAILABLE_MSG))
 
-        # TODO: uncoment when MPS works again - see FIXME in setup.py
-        if needs_mps:  # and not torch.backends.mps.is_available():
+        if needs_mps and not torch.backends.mps.is_available():
             item.add_marker(pytest.mark.skip(reason=MPS_NOT_AVAILABLE_MSG))
 
         if IN_FBCODE: