Multiprocess error triggers while trying example code

[Ch41r05]

Hi AmenRa,

First of all I'd like to thank you for your efforts. I'm trying to use retriv, but when I use the sample code you provided in the readme, I get the following error:

Building TDF matrix:   0%|                                                                                                                                                               | 0/4 [00:00<?, ?it/s]    vocabulary, X = self._count_vocab(raw_documents, self.fixed_vocabulary_)
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\sklearn\feature_extraction\text.py", line 1268, in _count_vocab
    for doc in raw_documents:
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\tqdm\std.py", line 1182, in __iter__
    for obj in iterable:
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multipipe\multipipe.py", line 28, in to_generator
    with Pool(n_threads) as pool:
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\context.py", line 119, in Pool
    return self._repopulate_pool_static(self._ctx, self.Process,
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\pool.py", line 329, in _repopulate_pool_static
    w.start()
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\context.py", line 336, in _Popen
    return Popen(process_obj)
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\popen_spawn_win32.py", line 45, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\spawn.py", line 154, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\mcelli\Documents\Training\Python\cosinematrix\venv\lib\site-packages\multiprocess\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.
    return Pool(processes, initializer, initargs, maxtasksperchild,

By just running the example code:

# Note: SearchEngine is an alias for the SparseRetriever
from retriv import SearchEngine

collection = [
  {"id": "doc_1", "text": "Generals gathered in their masses"},
  {"id": "doc_2", "text": "Just like witches at black masses"},
  {"id": "doc_3", "text": "Evil minds that plot destruction"},
  {"id": "doc_4", "text": "Sorcerer of death's construction"},
]

se = SearchEngine("new-index").index(collection)

se.search("witches masses")

Could you please help me fix this issue?

[AmenRa]

Hi, I cannot reproduce. I freshly installed retriv and its working correctly in my environment. I suspect it's an issue related to your operating system (see this).

Let me know if the following snippet works:

from retriv import SearchEngine

def main():
    collection = [
      {"id": "doc_1", "text": "Generals gathered in their masses"},
      {"id": "doc_2", "text": "Just like witches at black masses"},
      {"id": "doc_3", "text": "Evil minds that plot destruction"},
      {"id": "doc_4", "text": "Sorcerer of death's construction"},
    ]

    se = SearchEngine("new-index").index(collection)

    results = se.search("witches masses")
    print(results)

if __name__ == '__main__':
    main()

[Ch41r05]

Thanks @AmenRa , that was my case, stupidly forgot to check if that clause was there.

[AmenRa]

You are welcome! Please, consider giving retriv a star if you like it.