Remove broken MPS build (pytorch#8472)

Author: NicolasHug

setup.py

@@ -5,6 +5,7 @@
 import shutil
 import subprocess
 import sys
+import warnings
 
 import torch
 from pkg_resources import DistributionNotFound, get_distribution, parse_version
@@ -138,7 +139,6 @@ 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"
@@ -204,8 +204,15 @@ def get_extensions():
             define_macros += [("WITH_HIP", None)]
             nvcc_flags = []
         extra_compile_args["nvcc"] = nvcc_flags
-    elif torch.backends.mps.is_available() or force_mps:
-        sources += source_mps
+
+    # 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
 
     if sys.platform == "win32":
         define_macros += [("torchvision_EXPORTS", None)]