diff --git a/tools/setup_helpers/extension.py b/tools/setup_helpers/extension.py
index 043682aaf..c2fdcb384 100644
--- a/tools/setup_helpers/extension.py
+++ b/tools/setup_helpers/extension.py
@@ -4,20 +4,12 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-import distutils.sysconfig
+
 import os
-import platform
-import subprocess
-import sys
 from pathlib import Path
 
-from setuptools.command.build_ext import build_ext
-
 
-__all__ = [
-    "get_ext_modules",
-    "CMakeBuild",
-]
+__all__ = ["get_ext_modules"]
 
 
 _THIS_DIR = Path(__file__).parent.resolve()
@@ -38,96 +30,5 @@ def _get_build(var, default=False):
     return False
 
 
-_BUILD_S3 = _get_build("BUILD_S3", False)
-_USE_SYSTEM_AWS_SDK_CPP = _get_build("USE_SYSTEM_AWS_SDK_CPP", False)
-_USE_SYSTEM_PYBIND11 = _get_build("USE_SYSTEM_PYBIND11", False)
-_USE_SYSTEM_LIBS = _get_build("USE_SYSTEM_LIBS", False)
-
-
-try:
-    # Use the pybind11 from third_party
-    if not (_USE_SYSTEM_PYBIND11 or _USE_SYSTEM_LIBS):
-        sys.path.insert(0, str(_ROOT_DIR / "third_party/pybind11/"))
-    from pybind11.setup_helpers import Pybind11Extension
-except ImportError:
-    from setuptools import Extension as Pybind11Extension
-
-
 def get_ext_modules():
-    if _BUILD_S3:
-        return [Pybind11Extension(name="torchdata._torchdata", sources=[])]
-    else:
-        return []
-
-
-class CMakeBuild(build_ext):
-    def run(self):
-        try:
-            subprocess.check_output(["cmake", "--version"])
-        except OSError:
-            raise RuntimeError("CMake is not available.") from None
-        super().run()
-
-    def build_extension(self, ext):
-        # Because the following `cmake` command will build all of `ext_modules`` at the same time,
-        # we would like to prevent multiple calls to `cmake`.
-        # Therefore, we call `cmake` only for `torchdata._torchdata`,
-        # in case `ext_modules` contains more than one module.
-        if ext.name != "torchdata._torchdata":
-            return
-
-        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
-
-        # required for auto-detection of auxiliary "native" libs
-        if not extdir.endswith(os.path.sep):
-            extdir += os.path.sep
-
-        debug = int(os.environ.get("DEBUG", 0)) if self.debug is None else self.debug
-        cfg = "Debug" if debug else "Release"
-
-        cmake_args = [
-            f"-DCMAKE_BUILD_TYPE={cfg}",
-            f"-DCMAKE_INSTALL_PREFIX={extdir}",
-            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}",
-            f"-DCMAKE_RUNTIME_OUTPUT_DIRECTORY={extdir}",  # For Windows
-            f"-DPython_INCLUDE_DIR={distutils.sysconfig.get_python_inc()}",
-            f"-DBUILD_S3:BOOL={'ON' if _BUILD_S3 else 'OFF'}",
-            f"-DUSE_SYSTEM_AWS_SDK_CPP:BOOL={'ON' if _USE_SYSTEM_AWS_SDK_CPP else 'OFF'}",
-            f"-DUSE_SYSTEM_PYBIND11:BOOL={'ON' if _USE_SYSTEM_PYBIND11 else 'OFF'}",
-            f"-DUSE_SYSTEM_LIBS:BOOL={'ON' if _USE_SYSTEM_LIBS else 'OFF'}",
-        ]
-
-        build_args = ["--config", cfg]
-
-        # Default to Ninja
-        if "CMAKE_GENERATOR" not in os.environ or platform.system() == "Windows":
-            cmake_args += ["-GNinja"]
-        if platform.system() == "Windows":
-            python_version = sys.version_info
-            cmake_args += [
-                "-DCMAKE_C_COMPILER=cl",
-                "-DCMAKE_CXX_COMPILER=cl",
-                f"-DPYTHON_VERSION={python_version.major}.{python_version.minor}",
-            ]
-
-        # Set CMAKE_BUILD_PARALLEL_LEVEL to control the parallel build level
-        # across all generators.
-        if "CMAKE_BUILD_PARALLEL_LEVEL" not in os.environ:
-            # self.parallel is a Python 3 only way to set parallel jobs by hand
-            # using -j in the build_ext call, not supported by pip or PyPA-build.
-            if hasattr(self, "parallel") and self.parallel:
-                # CMake 3.12+ only.
-                build_args += [f"-j{self.parallel}"]
-
-        if not os.path.exists(self.build_temp):
-            os.makedirs(self.build_temp)
-
-        subprocess.check_call(["cmake", str(_ROOT_DIR)] + cmake_args, cwd=self.build_temp)
-        subprocess.check_call(["cmake", "--build", "."] + build_args, cwd=self.build_temp)
-
-    def get_ext_filename(self, fullname):
-        ext_filename = super().get_ext_filename(fullname)
-        ext_filename_parts = ext_filename.split(".")
-        without_abi = ext_filename_parts[:-2] + ext_filename_parts[-1:]
-        ext_filename = ".".join(without_abi)
-        return ext_filename
+    return []