(On my windows machine with 4+ logical processors)
| 0/1630 [00:00<?, ?it/s]Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\spawn.py", line 125, in _main
prepare(preparation_data)
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\runpy.py", line 289, in run_path
return _run_module_code(code, init_globals, run_name,
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\runpy.py", line 96, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\runpy.py", line 86, in _run_code
exec(code, run_globals)
File "C:\Users\me\source\repos\llms-from-scratch\build-nanogpt\fineweb.py", line 46, in <module>
with mp.Pool(nprocs) as pool:
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\context.py", line 119, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild,
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\pool.py", line 215, in __init__
self._repopulate_pool()
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\pool.py", line 306, in _repopulate_pool
return self._repopulate_pool_static(self._ctx, self.Process,
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\pool.py", line 329, in _repopulate_pool_static
w.start()
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\process.py", line 121, in start
self._popen = self._Popen(self)
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\context.py", line 336, in _Popen
return Popen(process_obj)
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\popen_spawn_win32.py", line 45, in __init__
prep_data = spawn.get_preparation_data(process_obj._name)
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\multiprocessing\spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "C:\Users\me\.pyenv\pyenv-win\versions\3.10.9\lib\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.
Implementation details
The error message itself and docs seem pretty clear that this is the pattern to use, and I can confirm it worked for me - it even nicely resumed, managing to save out the shards without redownloading. I'm not a python expert, so if there's a better way, then by all means do it.
I've currently decided to omit the freeze_support() call in this case since I haven't tested it and other changes may be needed to get frozen windows exes working.
Reviewing
I've split the extract method with indentation change from the behaviour change, if you view ignoring whitespace you can see it's a pretty simple change
Previous observed behaviour
(On my windows machine with 4+ logical processors)
Implementation details
The error message itself and docs seem pretty clear that this is the pattern to use, and I can confirm it worked for me - it even nicely resumed, managing to save out the shards without redownloading. I'm not a python expert, so if there's a better way, then by all means do it. I've currently decided to omit the
freeze_support()
call in this case since I haven't tested it and other changes may be needed to get frozen windows exes working.Reviewing
I've split the extract method with indentation change from the behaviour change, if you view ignoring whitespace you can see it's a pretty simple change
Many thanks for the video series and code!