chore: import upstream snapshot with attribution

op_builder/cpu/builder.py

@@ -0,0 +1,40 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+# DeepSpeed Team
+
+import os
+
+try:
+    # is op_builder from deepspeed or a 3p version? this should only succeed if it's deepspeed
+    # if successful this also means we're doing a local install and not JIT compile path
+    from op_builder import __deepspeed__  # noqa: F401 # type: ignore
+    from op_builder.builder import OpBuilder
+except ImportError:
+    from deepspeed.ops.op_builder.builder import OpBuilder
+
+
+class CPUOpBuilder(OpBuilder):
+
+    def builder(self):
+        from torch.utils.cpp_extension import CppExtension as ExtensionBuilder
+        include_dirs = [os.path.abspath(x) for x in self.strip_empty_entries(self.include_paths())]
+        compile_args = {'cxx': self.strip_empty_entries(self.cxx_args())}
+
+        cpp_ext = ExtensionBuilder(name=self.absolute_name(),
+                                   sources=self.strip_empty_entries(self.sources()),
+                                   include_dirs=include_dirs,
+                                   libraries=self.strip_empty_entries(self.libraries_args()),
+                                   extra_compile_args=compile_args)
+
+        return cpp_ext
+
+    def cxx_args(self):
+        args = ['-O3', '-g', '-Wno-reorder']
+        CPU_ARCH = self.cpu_arch()
+        SIMD_WIDTH = self.simd_width()
+        args += [CPU_ARCH, '-fopenmp', SIMD_WIDTH]
+        return args
+
+    def libraries_args(self):
+        return []