fix build in cpu env

Author: ygwpz

pyproject.toml

@@ -2,7 +2,6 @@
 requires = [
     "setuptools>=64",
     "cmake>=3.18",
-    "torch>=2.5.1",
     "wheel",
 ]
 build-backend = "setuptools.build_meta"

setup.py

@@ -76,12 +76,8 @@ def build_cmake(self, ext: CMakeExtension):
                 cmake_args += ["-DRUNTIME_ENVIRONMENT=maca"]
                 cmake_args += ["-DBUILD_UCM_SPARSE=OFF"]
             case _:
-                import torch
-
-                if hasattr(torch, "cuda") and torch.cuda.is_available():
-                    cmake_args += ["-DRUNTIME_ENVIRONMENT=cuda"]
-                else:
-                    cmake_args += ["-DRUNTIME_ENVIRONMENT=ascend"]
+                cmake_args += ["-DRUNTIME_ENVIRONMENT=simu"]
+                cmake_args += ["-DBUILD_UCM_SPARSE=OFF"]
 
         subprocess.check_call(
             ["cmake", *cmake_args, ext.cmake_file_path], cwd=build_dir