Also tried this as well, and again I ran into the very same error…
EDIT: So I transfered all the code from the Jupyter Notebook into a plain .py script and let the relevant part run again, now actually receiving a different error message. Not sure tho, if this may help to come closer to the issue 
Using custom data configuration default-8f1dcd17d8b8834c
Reusing dataset text (C:\Users\s_scho53\.cache\huggingface\datasets\text\default-8f1dcd17d8b8834c\0.0.0\e16f44aa1b321ece1f87b07977cc5d70be93d69b20486d6dacd62e12cf25c9a5)
Token indices sequence length is longer than the specified maximum sequence length for this model (4078 > 512). Running this sequence through the model will result in indexing errors
Using custom data configuration default-8f1dcd17d8b8834c
Reusing dataset text (C:\Users\s_scho53\.cache\huggingface\datasets\text\default-8f1dcd17d8b8834c\0.0.0\e16f44aa1b321ece1f87b07977cc5d70be93d69b20486d6dacd62e12cf25c9a5)
Using custom data configuration default-8f1dcd17d8b8834c
Reusing dataset text (C:\Users\s_scho53\.cache\huggingface\datasets\text\default-8f1dcd17d8b8834c\0.0.0\e16f44aa1b321ece1f87b07977cc5d70be93d69b20486d6dacd62e12cf25c9a5)
Token indices sequence length is longer than the specified maximum sequence length for this model (4078 > 512). Running this sequence through the model will result in indexing errors
Token indices sequence length is longer than the specified maximum sequence length for this model (4078 > 512). Running this sequence through the model will result in indexing errors
Traceback (most recent call last):
  File "<string>", line 1, in <module>
Traceback (most recent call last):
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 116, in spawn_main
  File "<string>", line 1, in <module>
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 116, in spawn_main
        exitcode = _main(fd, parent_sentinel)
exitcode = _main(fd, parent_sentinel)
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 125, in _main
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 125, in _main
    prepare(preparation_data)
      File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 236, in prepare
prepare(preparation_data)
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 236, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 287, in _fixup_main_from_path
    _fixup_main_from_path(data['init_main_from_path'])
    main_content = runpy.run_path(main_path,  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 287, in _fixup_main_from_path

  File "C:\Python\lib\runpy.py", line 265, in run_path
    main_content = runpy.run_path(main_path,
  File "C:\Python\lib\runpy.py", line 265, in run_path
    return _run_module_code(code, init_globals, run_name,    return _run_module_code(code, init_globals, run_name,

  File "C:\Python\lib\runpy.py", line 97, in _run_module_code
  File "C:\Python\lib\runpy.py", line 97, in _run_module_code
        _run_code(code, mod_globals, init_globals,_run_code(code, mod_globals, init_globals,

  File "C:\Python\lib\runpy.py", line 87, in _run_code
  File "C:\Python\lib\runpy.py", line 87, in _run_code
        exec(code, run_globals)exec(code, run_globals)

  File "c:\Users\s_scho53\Desktop\L09_Desktop\_FiLMo\Untitled-1.py", line 41, in <module>
  File "c:\Users\s_scho53\Desktop\L09_Desktop\_FiLMo\Untitled-1.py", line 41, in <module>
        datasets = datasets.map(datasets = datasets.map(

  File "C:\Python\lib\site-packages\datasets\dataset_dict.py", line 432, in map
  File "C:\Python\lib\site-packages\datasets\dataset_dict.py", line 432, in map
        {{

  File "C:\Python\lib\site-packages\datasets\dataset_dict.py", line 433, in <dictcomp>
  File "C:\Python\lib\site-packages\datasets\dataset_dict.py", line 433, in <dictcomp>
    k: dataset.map(
      File "C:\Python\lib\site-packages\datasets\arrow_dataset.py", line 1452, in map
k: dataset.map(
  File "C:\Python\lib\site-packages\datasets\arrow_dataset.py", line 1452, in map
        with Pool(num_proc, initargs=(RLock(),), initializer=tqdm.set_lock) as pool:with Pool(num_proc, initargs=(RLock(),), initializer=tqdm.set_lock) as pool:

  File "C:\Python\lib\site-packages\multiprocess\context.py", line 119, in Pool
  File "C:\Python\lib\site-packages\multiprocess\context.py", line 119, in Pool
        return Pool(processes, initializer, initargs, maxtasksperchild,return Pool(processes, initializer, initargs, maxtasksperchild,

  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 212, in __init__
  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 212, in __init__
        self._repopulate_pool()self._repopulate_pool()

  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 303, in _repopulate_pool
  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 303, in _repopulate_pool
    return self._repopulate_pool_static(self._ctx, self.Process,
return self._repopulate_pool_static(self._ctx, self.Process,  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 326, in _repopulate_pool_static

  File "C:\Python\lib\site-packages\multiprocess\pool.py", line 326, in _repopulate_pool_static
    w.start()
  File "C:\Python\lib\site-packages\multiprocess\process.py", line 121, in start
    w.start()
  File "C:\Python\lib\site-packages\multiprocess\process.py", line 121, in start
    self._popen = self._Popen(self)
      File "C:\Python\lib\site-packages\multiprocess\context.py", line 327, in _Popen
self._popen = self._Popen(self)
      File "C:\Python\lib\site-packages\multiprocess\context.py", line 327, in _Popen
return Popen(process_obj)
  File "C:\Python\lib\site-packages\multiprocess\popen_spawn_win32.py", line 45, in __init__
    return Popen(process_obj)
  File "C:\Python\lib\site-packages\multiprocess\popen_spawn_win32.py", line 45, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
      File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 154, in get_preparation_data
prep_data = spawn.get_preparation_data(process_obj._name)
      File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
  File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 134, in _check_not_importing_main
    _check_not_importing_main()
      File "C:\Python\lib\site-packages\multiprocess\spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
    RuntimeError: raise 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.

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.