Multiprocessing problem under Windows

[ttdeshuo]

I have modified the code according to Windows Support is very experimental! However, the problem also occurs as follows. Have any method to solve it?

Traceback (most recent call last):
File "F:/ki67/batchgenerator_example.py", line 106, in
main()
File "F:/ki67/batchgenerator_example.py", line 97, in main
tr_gen.restart()
File "C:\Users\Admin.conda\envs\py352\lib\site-packages\batchgenerators\dataloading\multi_threaded_augmenter.py", line 292, in restart
self._start()
File "C:\Users\Admin.conda\envs\py352\lib\site-packages\batchgenerators\dataloading\multi_threaded_augmenter.py", line 244, in _start
self._processes[-1].start()
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\process.py", line 105, in start
self._popen = self._Popen(self)
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\context.py", line 212, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\context.py", line 313, in _Popen
return Popen(process_obj)
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\popen_spawn_win32.py", line 66, in init
reduction.dump(process_obj, to_child)
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\reduction.py", line 59, in dump
ForkingPickler(file, protocol).dump(obj)
ValueError: ctypes objects containing pointers cannot be pickled
Exception ignored in: <bound method MultiThreadedAugmenter.del of <batchgenerators.dataloading.multi_threaded_augmenter.MultiThreadedAugmenter object at 0x0000022D094A66D8>>
Traceback (most recent call last):
File "C:\Users\Admin.conda\envs\py352\lib\site-packages\batchgenerators\dataloading\multi_threaded_augmenter.py", line 296, in del
self._finish()
File "C:\Users\Admin.conda\envs\py352\lib\site-packages\batchgenerators\dataloading\multi_threaded_augmenter.py", line 275, in _finish
[i.terminate() for i in self._processes]
File "C:\Users\Admin.conda\envs\py352\lib\site-packages\batchgenerators\dataloading\multi_threaded_augmenter.py", line 275, in
[i.terminate() for i in self._processes]
File "C:\Users\Admin.conda\envs\py352\lib\multiprocessing\process.py", line 113, in terminate
self._popen.terminate()
AttributeError: 'NoneType' object has no attribute 'terminate'

[FabianIsensee]

Hi,
the error you are looking for is ValueError: ctypes objects containing pointers cannot be pickled which points to a typical windows problem with python and multiprocessing, see also https://stackoverflow.com/questions/8804830/python-multiprocessing-picklingerror-cant-pickle-type-function
I cannot really help you here because I don't use Windows for work-related stuff. Sorry :-/
Best,
Fabian