import importlib

TORCH_AVAILABLE = False

_torch = None

_torch_import_error = None

def _import_torch():

global _torch, TORCH_AVAILABLE, _torch_import_error

try:

_torch = importlib.import_module("torch")

TORCH_AVAILABLE = True

except Exception as e:

# Catch import errors including CUDA lib missing

TORCH_AVAILABLE = False

_torch_import_error = e

_import_torch()

def get_torch():

"""

Return the torch module if available, else raise a friendly error.

This prevents crashing on import if CUDA libs are missing.

"""

if TORCH_AVAILABLE:

return _torch

else:

error_message = (

"Torch is not available or failed to import.\n"

"Original error:\n"

f"{_torch_import_error}\n\n"

"If you are on a CPU-only system, make sure you install the CPU-only torch wheel:\n"

" pip install torch torchvision -f https://download.pytorch.org/whl/cpu\n"

"Or check your CUDA installation if using GPU torch.\n"

)

raise ImportError(error_message) from _torch_import_error