Hi,
I correctly installed odtbrain with all dependencies. When I try to run "backprop_from_fdtd_3d.py" or any other examples which includes multiprocessing codes, terminal shows an error like given below.
I checked from stackoverflow, it seems that multiprocessing codes should be integrated into" init", but I could not succeed. Can you please check, if possible ?
Thanks in advance.
Traceback (most recent call last):
File "", line 1, in
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 125, in _main
prepare(preparation_data)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 268, in run_path
return _run_module_code(code, init_globals, run_name,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 97, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/Users/gkirabali/examples/backprop_from_fdtd_3d.py", line 37, in
f = odt.backpropagate_3d(uSin=sinoRytov,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/site-packages/odtbrain/_alg3d_bpp.py", line 486, in backpropagate_3d
pool4loop = mp.Pool(processes=num_cores,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/context.py", line 119, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 212, in init
self._repopulate_pool()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 303, in _repopulate_pool
return self._repopulate_pool_static(self._ctx, self.Process,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 326, in _repopulate_pool_static
w.start()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 32, in init
Traceback (most recent call last):
File "", line 1, in
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 116, in spawn_main
super().init(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_fork.py", line 19, in init
exitcode = _main(fd, parent_sentinel)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 125, in _main
prepare(preparation_data)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 268, in run_path
self._launch(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 42, in _launch
return _run_module_code(code, init_globals, run_name,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 97, in _run_module_code
prep_data = spawn.get_preparation_data(process_obj._name)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
_run_code(code, mod_globals, init_globals,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/runpy.py", line 87, in _run_code
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.
exec(code, run_globals)
File "/Users/gkirabali/examples/backprop_from_fdtd_3d.py", line 37, in
f = odt.backpropagate_3d(uSin=sinoRytov,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/site-packages/odtbrain/_alg3d_bpp.py", line 486, in backpropagate_3d
pool4loop = mp.Pool(processes=num_cores,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/context.py", line 119, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 212, in init
self._repopulate_pool()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 303, in _repopulate_pool
return self._repopulate_pool_static(self._ctx, self.Process,
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/pool.py", line 326, in _repopulate_pool_static
w.start()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 32, in init
super().init(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_fork.py", line 19, in init
self._launch(process_obj)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 42, in _launch
prep_data = spawn.get_preparation_data(process_obj._name)
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "/Users/gkirabali/opt/miniconda3/envs/myenv/lib/python3.9/multiprocessing/spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.