start.py

# start.py - ensure torch is installed at runtime then run app.py
import os, sys, subprocess

def ensure_torch():
    try:
        import torch
        print("torch present:", torch.__version__)
        return
    except Exception:
        print("Installing CPU torch...")
        subprocess.check_call([sys.executable, "-m", "pip", "install", "--no-cache-dir",
                               "torch==2.2.0+cpu", "--extra-index-url", "https://download.pytorch.org/whl/cpu"])
        import torch
        print("Installed torch", torch.__version__)

if __name__ == "__main__":
    ensure_torch()
    os.execv(sys.executable, [sys.executable, "app.py"])