Project-MONAI / Project-MONAI/tutorials

run error in monailabel

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Description

Hello, thank you very much for your great work on MONAI Label.

When I tried to run the following command:
monailabel start_server --app apps/monaibundle --studies datasets/venous_liver --conf models pancreas_ct_dints_segmentation
I encountered this error:
File "D:\anaconda\envs\monailabel\lib\site-packages\monai\bundle\config_item.py", line 374, in evaluate return eval(value[len(self.prefix) :], globals_, locals) File "<string>", line 1, in <module> File "D:\anaconda\envs\monailabel\lib\site-packages\torch\serialization.py", line 1524, in load raise pickle.UnpicklingError(_get_wo_message(str(e))) from None _pickle.UnpicklingError: Weights only load failed. This file can still be loaded, to do so you have two options, do those steps only if you trust the source of the checkpoint. (1) In PyTorch 2.6, we changed the default value of the weights_onlyargument intorch.loadfromFalsetoTrue. Re-running torch.loadwithweights_onlyset toFalsewill likely succeed, but it can result in arbitrary code execution. Do it only if you got the file from a trusted source. (2) Alternatively, to load withweights_only=Trueplease check the recommended steps in the following error message. WeightsUnpickler error: Unsupported global: GLOBAL numpy.core.multiarray._reconstruct was not an allowed global by default. Please usetorch.serialization.add_safe_globals([numpy.core.multiarray._reconstruct])or thetorch.serialization.safe_globals([numpy.core.multiarray._reconstruct])context manager to allowlist this global if you trust this class/function.
`RuntimeError: Failed to evaluate ConfigExpression:
"$torch.load(__local_refs['arch_ckpt_path'], map_location=torch.device('cuda'))"

[2025-07-07 21:02:28,103] [19056] [MainThread] [ERROR] (uvicorn.error:59) - Application startup failed. Exiting.`

Here is my PyTorch version:
Name: torch Version: 2.7.1+cu128 Summary: Tensors and Dynamic neural networks in Python with strong GPU acceleration Home-page: https://pytorch.org/ Author: PyTorch Team Author-email: packages@pytorch.org License: BSD-3-Clause Location: d:\anaconda\envs\monailabel\lib\site-packages Requires: filelock, fsspec, jinja2, networkx, sympy, typing-extensions Required-by: lpips, monai, pytorch-ignite, sam2, torchaudio, torchio, torchvision

Could you please advise me on how to properly resolve this issue?

Thank you very much for your time and help!

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported monailabel start_server command with PyTorch 2.7.1 and inspect the torch.load expression in the error. Confirm whether the checkpoint-loading behavior is caused by the reported PyTorch version and define completion as a documented or verified way for the application to start without this error.

Written by the indexing model from the issue text.

Assessment

Tech stack
python, pytorch
Domain
machine-learning
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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