Ошибка многопроцессорной обработки Python с IBM API (Q Experience)

Question

Ошибка многопроцессорной обработки Python с IBM API (Q Experience)

Я пытаюсь использовать API IBM Q Experience, установил библиотеку и написал код быстрого тестирования. Сначала он не смог найти модуль. Затем я добавил всю систему sys. По общему признанию, я только что скопировал это из сообщения stackru, так что это может быть проблемой. В любом случае, я получил "RunTime Error", которая приводит к многопроцессорному запуску Python. У IBM Q нет большого сообщества, поэтому я не смог ничего найти после небольшого исследования. Я совершенно незнаком с многопроцессорностью, многопоточностью и т. Д., Поэтому я представляю, что просто увидеть код и ошибку будет лучше, чем все, что я могу сделать, чтобы объяснить. Заранее спасибо.

import sys
sys.path.append("../../")

from qiskit import QuantumProgram

#visualization
from tools.visualization import plot_histogram

#set up registers
qp = QuantumProgram()
q = qp.create_quantum_register("q", 3)
c = qp.create_classical_register("c", 3)

#define our circuit
threeQ = qp.create_circuit("threeQ", [q], [c])
threeQ.measure(q[0], c[0])
threeQ.measure(q[1], c[1])
threeQ.measure(q[2], c[2])

#run
result = qp.execute(["threeQ"])

#plot
plot_histogram(result.get_counts("threeQ"))

Я получаю ошибку (извините, это долго):

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 106, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 115, in _main
    prepare(preparation_data)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 226, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 278, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 254, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Everybody\firstquantum.py", line 21, in <module>
    print(qp.execute(["threeQ"]))
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1413, in execute
    result = self.run(qobj, wait=wait, timeout=timeout)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1232, in run
    timeout=timeout)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1315, in _run_internal
    job_processor.submit()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_jobprocessor.py", line 118, in submit
    future = executor.submit(run_backend, q_job)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 454, in submit
    self._start_queue_management_thread()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 415, in _start_queue_management_thread
    self._adjust_process_count()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 434, in _adjust_process_count
    p.start()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\popen_spawn_win32.py", line 34, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 144, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 137, in _check_not_importing_main
    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.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 106, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 115, in _main
    prepare(preparation_data)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 226, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 278, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 254, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Everybody\firstquantum.py", line 21, in <module>
    print(qp.execute(["threeQ"]))
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1413, in execute
    result = self.run(qobj, wait=wait, timeout=timeout)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1232, in run
    timeout=timeout)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_quantumprogram.py", line 1315, in _run_internal
    job_processor.submit()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\site-packages\qiskit\_jobprocessor.py", line 118, in submit
    future = executor.submit(run_backend, q_job)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 454, in submit
    self._start_queue_management_thread()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 415, in _start_queue_management_thread
    self._adjust_process_count()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\concurrent\futures\process.py", line 434, in _adjust_process_count
    p.start()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\popen_spawn_win32.py", line 34, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 144, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 137, in _check_not_importing_main
    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.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 106, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 115, in _main
    prepare(preparation_data)
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 226, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 278, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Everybody\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 254, in run_path
ERROR

1

windows multiprocessing runtime-error quantum-computing qiskit

Источник

user7717192 25 янв '18 в 23:38

1 ответ

Решение

Другие вопросы по тегам windows multiprocessing runtime-error quantum-computing qiskit

user9072716 26 янв '18 в 23:28 2018-01-26 23:28 · Accepted Answer · 2018-01-26 23:28

Это общая проблема с многопоточностью в Python для Windows. Решение состоит в том, чтобы поместить ваш код верхнего уровня в блок if __name__ == "__main__", например:

if __name__ == '__main__':
    <your code here>

Надеюсь, это поможет!

3

Источник

user9072716 26 янв '18 в 23:28