Enable setuptools build process

Author: kbattocchi

econml/grf/setup.py

@@ -0,0 +1,12 @@
+[build-system]
+requires = [
+    "setuptools",
+    "wheel",
+    "pytest-runner",
+    "Cython",
+    "sphinx < 3.2",
+    "sphinx_rtd_theme",
+    "numpy == 1.19.3",
+    "scipy"
+]
+build-backend = "setuptools.build_meta"

pyproject.toml

@@ -36,6 +36,7 @@ setup_requires =
     pytest-runner
     sphinx < 3.2
     sphinx_rtd_theme
+    Cython
 install_requires =
     numpy
     scipy != 1.4.0

setup.cfg

@@ -1,22 +1,10 @@
-import sys
-import os
+from setuptools import setup, find_packages
+from setuptools.extension import Extension
+from Cython.Build import cythonize
+import numpy as np
 
 
-def configuration(parent_package='', top_path=None):
-    from numpy.distutils.misc_util import Configuration
-    import numpy
-
-    libraries = []
-    if os.name == 'posix':
-        libraries.append('m')
-
-    config = Configuration(None, parent_package, top_path)
-
-    config.add_subpackage('econml')
-
-    return config
-
-
-if __name__ == '__main__':
-    from numpy.distutils.core import setup
-    setup(**configuration(top_path='').todict())
+# configuration is all pulled from setup.cfg
+setup(ext_modules=cythonize([Extension("*", ["econml/grf/*.pyx"],
+                                       include_dirs=[np.get_include()])],
+                            language_level="3"))