updated wheels installation

_Pre_Builds/_Build_Scripts/build_utils.py

@@ -250,6 +250,50 @@ def install_platform_packages():
             print(f"Installing platform package {package}...")
             subprocess.run([PYTHON_PATH, "-s", "-m", "pip", "install", package])
 
+def install_spconv():
+    """Simple spconv installation with correct CUDA version"""
+    # Check if spconv is already installed
+    try:
+        import spconv.core_cc
+        print("spconv is already installed and working")
+        return True
+    except ImportError:
+        pass
+    
+    # Get CUDA version mapping
+    if not hasattr(build_config, 'spconv_cuda_mapping'):
+        print("No spconv_cuda_mapping in config, skipping spconv installation")
+        return True
+    
+    # Convert CUDA_VERSION (e.g. cu128 -> 12.8) for lookup
+    cuda_version_for_lookup = CUDA_VERSION[2:3] + '.' + CUDA_VERSION[3:]
+    cuda_suffix = build_config.spconv_cuda_mapping.get(cuda_version_for_lookup)
+    
+    if not cuda_suffix:
+        print(f"No spconv mapping for CUDA {cuda_version_for_lookup}, skipping")
+        return True
+    
+    spconv_package = f"spconv-{cuda_suffix}"
+    print(f"Installing {spconv_package}...")
+    
+    result = subprocess.run(
+        [PYTHON_PATH, "-m", "pip", "install", spconv_package],
+        text=True, capture_output=True
+    )
+    
+    if result.returncode != 0:
+        print(f"Failed to install {spconv_package}: {result.stderr}")
+        return False
+    
+    # Verify installation
+    try:
+        import spconv.core_cc
+        print(f"Successfully installed and verified {spconv_package}")
+        return True
+    except ImportError as e:
+        print(f"spconv installed but verification failed: {e}")
+        return False
+
 def wheels_dir_exists_and_not_empty(builds_dir):
     if not os.path.exists(builds_dir):
         return False