Change of ROI size causes "Application startup failed" error

Discussed in https://github.com/Project-MONAI/MONAILabel/discussions/1534

^{Originally posted by niklu-igloo August 29, 2023}
Hi,

my name is Nicholas and I want to change the ROI size as adviced by @diazandr3s on the Discussion https://github.com/Project-MONAI/MONAILabel/discussions/943. I have encountered a problem when I modify /lib/configs/localization_spine.py script and I change the parameter "self.roi_size" to (48, 48, 48) on line 74 (https://github.com/Project-MONAI/MONAILabel/blob/720864189a61a3952cd533ca02ff03b59c33a8f0/sample-apps/radiology/lib/configs/localization_spine.py#L74C9-L74C80). Here is the resulting error I get once I start monailabel after I saved the modified python script:

(monai) $MY_USER:~/$FOLDER$ monailabel start_server --app radiology5 --studies $STUDY --conf models localization_spine
Using PYTHONPATH=/anaconda/envs:

[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: version = False
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: app = /$FOLDER/radiology5
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: studies = $STUDY
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: verbose = INFO
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: conf = [['models', 'localization_spine']]
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: host = 0.0.0.0
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: port = 8000
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: uvicorn_app = monailabel.app:app
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: ssl_keyfile = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: ssl_certfile = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: ssl_keyfile_password = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: ssl_ca_certs = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: workers = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: limit_concurrency = None
[2023-08-29 11:34:52,439] [21627] [MainThread] [INFO] (__main__:285) - USING:: access_log = False
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:285) - USING:: root_path = /
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:285) - USING:: log_level = info
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:285) - USING:: log_config = None
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:285) - USING:: dryrun = False
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:285) - USING:: action = start_server
[2023-08-29 11:34:52,440] [21627] [MainThread] [INFO] (__main__:296) - 
Allow Origins: ['*']
[2023-08-29 11:34:53,045] [21627] [MainThread] [INFO] (uvicorn.error:74) - Started server process [21627]
[2023-08-29 11:34:53,045] [21627] [MainThread] [INFO] (uvicorn.error:48) - Waiting for application startup.
[2023-08-29 11:34:53,045] [21627] [MainThread] [INFO] (monailabel.interfaces.utils.app:37) - Initializing App from: /$FOLDER/radiology5; studies: $STUDY; conf: {'models': 'localization_spine'}
[2023-08-29 11:34:53,512] [21627] [MainThread] [ERROR] (uvicorn.error:123) - Traceback (most recent call last):
  File "/anaconda/envs/monai/lib/python3.8/site-packages/starlette/routing.py", line 677, in lifespan
    async with self.lifespan_context(app) as maybe_state:
  File "/anaconda/envs/monai/lib/python3.8/site-packages/starlette/routing.py", line 566, in __aenter__
    await self._router.startup()
  File "/anaconda/envs/monai/lib/python3.8/site-packages/starlette/routing.py", line 654, in startup
    await handler()
  File "/anaconda/envs/monai/lib/python3.8/site-packages/monailabel/app.py", line 108, in startup_event
    instance = app_instance()
  File "/anaconda/envs/monai/lib/python3.8/site-packages/monailabel/interfaces/utils/app.py", line 43, in app_instance
    c = get_class_of_subclass_from_file("main", main_py, "MONAILabelApp")
  File "/anaconda/envs/monai/lib/python3.8/site-packages/monailabel/utils/others/class_utils.py", line 75, in get_class_of_subclass_from_file
    return get_class_of_subclass(module_from_file(module_name, file_path), class_c)
  File "/anaconda/envs/monai/lib/python3.8/site-packages/monailabel/utils/others/class_utils.py", line 45, in module_from_file
    spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 843, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "$FOLDER/radiology5/main.py", line 18, in <module>
    from lib.activelearning import Last
ImportError: cannot import name 'Last' from 'lib.activelearning' (unknown location)

[2023-08-29 11:34:53,512] [21627] [MainThread] [ERROR] (uvicorn.error:59) - Application startup failed. Exiting.

Could you please tell me if why this change doesn't seem to be applied and why I cannot let the model run anymore?

Thank you.

I wish all a good day,
Nicholas

Start with sample-apps/radiology/lib/configs/localization_spine.py at the self.roi_size setting, then inspect the radiology app's main.py and the lib.activelearning import shown in the traceback. Run the provided monailabel start_server command and determine whether changing the ROI size causes or merely exposes the missing Last import; done means the application starts successfully with the requested ROI size.