PicklingError: Can't pickle : attribute lookup __builtin__.instancemethod failed

При роботі з пітонівським модулем multiprocessing  зіштовхнувся з pickling error, яка з’явилася при виклку метода map об’єкта класу Pool. 
Проблема полягала в тому, що я передавав акгументом (обробник) - метод класу, а оскільки класс не серіалізований, то і виникла помилка.
Хінт про який я прочитав тут, значно допоміг, проте не ідеальний.
Є ще варіант - copy_reg
Загалом про проблему можна почитати тут.

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