verify_cuda.py

import torch

print(f"PyTorch version: {torch.__version__}")
print(f"CUDA available: {torch.cuda.is_available()}")

if torch.cuda.is_available():
    print(f"CUDA version PyTorch was built with: {torch.version.cuda}")
    print(f"Number of GPUs: {torch.cuda.device_count()}")
    print(f"Current device: {torch.cuda.current_device()}")
    print(f"Device name: {torch.cuda.get_device_name(torch.cuda.current_device())}")
else:
    print("\n❌ PyTorch cannot find CUDA.")
    print("   Follow the 'Foolproof Plan' to fix your environment.")