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yuqinie98 / PatchTST

An offical implementation of PatchTST: "A Time Series is Worth 64 Words: Long-term Forecasting with Transformers." (ICLR 2023) https://arxiv.org/abs/2211.14730
Apache License 2.0
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RuntimeError on Mac trying python multiprocessing #56

Closed koseoyoung closed 1 year ago

koseoyoung commented 1 year ago

Hi, thanks for the valuable work! While following the README, I encountered one issue and fixed it according to this StackOverflow answer. Just wanted to share this with others! 

$sh ./scripts/PatchTST/etth1.sh
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/spawn.py", line 125, in _main
    prepare(preparation_data)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/spawn.py", line 236, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
    main_content = runpy.run_path(main_path,
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/runpy.py", line 289, in run_path
    return _run_module_code(code, init_globals, run_name,
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/runpy.py", line 96, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/Users/dorothyko/network-ml/PatchTST/PatchTST_supervised/run_longExp.py", line 139, in <module>
    exp.train(setting)
  File "/Users/dorothyko/network-ml/PatchTST/PatchTST_supervised/exp/exp_main.py", line 132, in train
    for i, (batch_x, batch_y, batch_x_mark, batch_y_mark) in enumerate(train_loader):
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/site-packages/torch/utils/data/dataloader.py", line 368, in __iter__
    return self._get_iterator()
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/site-packages/torch/utils/data/dataloader.py", line 314, in _get_iterator
    return _MultiProcessingDataLoaderIter(self)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/site-packages/torch/utils/data/dataloader.py", line 927, in __init__
    w.start()
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/context.py", line 288, in _Popen
    return Popen(process_obj)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 32, in __init__
    super().__init__(process_obj)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/popen_fork.py", line 19, in __init__
    self._launch(process_obj)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 42, in _launch
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/multiprocessing/spawn.py", line 154, in get_preparation_data
    _check_not_importing_main()
  File "/Users/dorothyko/miniconda3/envs/patchtst/lib/python3.10/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.

This has been fixed by https://stackoverflow.com/questions/18204782/runtimeerror-on-windows-trying-python-multiprocessing

If needed, I can send out a fixup PR for this.

yuqinie98 commented 1 year ago

Thanks very much for sharing this! We haven't tested this on Mac, so this is a very valuable suggestion!