[OpenReg] add pyproject.toml for openreg (#158440)

As the title stated.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/158440
Approved by: https://github.com/albanD
ghstack dependencies: #158415

test/cpp_extensions/open_registration_extension/torch_openreg/README.md

@@ -47,6 +47,7 @@ torch_openreg/
 │       ├── OpenRegHostAllocator.cpp
 │       ├── OpenRegHostAllocator.h
 │       └── ...
+├── pyproject.toml
 ├── README.md
 ├── setup.py
 ├── third_party
@@ -144,9 +145,8 @@ There are 4 DSOs in torch_openreg, and the dependencies between them are as foll
 ### Installation
 
 ```python
-pip3 install -r requirements.txt
-
-python setup.py develop/install
+pip3 install --no-build-isolation -e . # for develop
+pip3 install --no-build-isolation . # for install
 ```
 
 ### Usage Example

test/cpp_extensions/open_registration_extension/torch_openreg/pyproject.toml

@@ -0,0 +1,35 @@
+[build-system]
+requires = [
+    "setuptools",
+    "wheel",
+    "torch", # Needed by setup.py for getting include of PyTorch
+]
+
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "torch_openreg"
+version = "0.0.1"
+description = "A minimal reference implementation of an out-of-tree backend"
+readme = "README.md"
+requires-python = ">=3.9"
+license = { text = "BSD-3-Clause" }
+authors = [{ name = "PyTorch Team", email = "packages@pytorch.org" }]
+dependencies = [
+    "torch",
+]
+# Add classifiers info for making lint happy
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Topic :: Software Development",
+    "Topic :: Software Development :: Libraries",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Programming Language :: C++",
+    "Programming Language :: Python :: 3 :: Only",
+]
+
+[project.urls]
+Homepage = "https://pytorch.org"
+Repository = "https://github.com/pytorch/pytorch"
+Documentation = "https://pytorch.org/docs"
+Forum = "https://discuss.pytorch.org"

test/cpp_extensions/open_registration_extension/torch_openreg/requirements.txt

@@ -1 +0,0 @@
-torch

test/cpp_extensions/open_registration_extension/torch_openreg/setup.py

@@ -9,8 +9,8 @@ from distutils.command.clean import clean
 from setuptools import Extension, find_packages, setup
 
 
-PACKAGE_NAME = "torch_openreg"
 BASE_DIR = os.path.dirname(os.path.realpath(__file__))
+RUN_BUILD_DEPS = any(arg in {"clean", "dist_info"} for arg in sys.argv)
 
 
 def get_pytorch_dir():
@@ -49,7 +49,7 @@ def build_deps():
 
 class BuildClean(clean):
     def run(self):
-        for i in ["build", "install", "torch_openreg.egg-info", "torch_openreg/lib"]:
+        for i in ["build", "install", "torch_openreg/lib"]:
             dirs = os.path.join(BASE_DIR, i)
             if os.path.exists(dirs) and os.path.isdir(dirs):
                 shutil.rmtree(dirs)
@@ -60,9 +60,6 @@ class BuildClean(clean):
                     os.remove(os.path.join(dirpath, filename))
 
 
-RUN_BUILD_DEPS = any(arg == "clean" for arg in sys.argv)
-
-
 def main():
     if not RUN_BUILD_DEPS:
         build_deps()
@@ -71,6 +68,7 @@ def main():
         Extension(
             name="torch_openreg._C",
             sources=["torch_openreg/csrc/stub.c"],
+            language="c",
             extra_compile_args=["-g", "-Wall", "-Werror"],
             libraries=["torch_bindings"],
             library_dirs=[os.path.join(BASE_DIR, "torch_openreg/lib")],
@@ -78,20 +76,12 @@ def main():
         )
     ]
 
-    package_data = {PACKAGE_NAME: ["lib/*.so*"]}
+    package_data = {"torch_openreg": ["lib/*.so*"]}
 
     setup(
-        name=PACKAGE_NAME,
-        version="0.0.1",
-        author="PyTorch Core Team",
-        description="Example for PyTorch out of tree registration",
-        packages=find_packages(exclude=("test",)),
+        packages=find_packages(),
         package_data=package_data,
-        install_requires=[
-            "torch",
-        ],
         ext_modules=ext_modules,
-        python_requires=">=3.8",
         cmdclass={
             "clean": BuildClean,  # type: ignore[misc]
         },

test/cpp_extensions/open_registration_extension/torch_openreg/torch_openreg/__init__.py

@@ -1,4 +1,5 @@
 import torch
+
 import torch_openreg._C  # type: ignore[misc]
 import torch_openreg.openreg
 

test/cpp_extensions/open_registration_extension/torch_openreg/torch_openreg/openreg/__init__.py

@@ -1,4 +1,5 @@
 import torch
+
 import torch_openreg._C  # type: ignore[misc]
 
 

test/cpp_extensions/open_registration_extension/torch_openreg/torch_openreg/openreg/random.py

@@ -1,4 +1,5 @@
 import torch
+
 import torch_openreg._C  # type: ignore[misc]
 
 from . import _lazy_init, current_device, device_count