1

我正在尝试在 QuTiP 中运行一些代码，但是当我并行运行一个函数parfor时出现错误。

results= parfor(func2, range(len(delta)))

错误：

AssertionError
     Traceback (most recent call last)
<ipython-input-206-6c2ffcb32b4f> in <module>()
----> 1 results= parfor(func2, range(len(delta)))

/usr/lib/python2.7/dist-packages/qutip/parallel.pyc in parfor(func, *args, **kwargs)
    119     try:
    120         map_args = ((func, v, os.getpid()) for v in var)
--> 121         par_return = list(pool.map(task_func, map_args))
    122 
    123         pool.terminate()

/usr/lib/python2.7/multiprocessing/pool.py in map(self, func, iterable, chunksize)
    249         '''
    250         assert self._state == RUN
--> 251         return self.map_async(func, iterable, chunksize).get()
    252 
    253     def imap(self, func, iterable, chunksize=1):

/usr/lib/python2.7/multiprocessing/pool.py in get(self, timeout)
    556             return self._value
    557         else:
--> 558             raise self._value
    559 
    560     def _set(self, i, obj):

AssertionError: daemonic processes are not allowed to have children

这是我的代码：

def func2(x):
    def H1_coeff(t,args):
       return exp(-((t-4)/2.0) ** 2)
    H0 = np.pi*w * a.dag() *a
    Hi= delta[x]*(a.dag())

    H = [H0, [Hi,H1_coeff]]
    result = mesolve(H, psi0, tlist, c_ops, [])
    numer=expect(n,result.states)

    print delta[x], "done"
    return numer

有人知道这里有什么问题吗？

4

1 回答 1

0

我认为您需要将 H1_coeff 的定义移到 func2 之外。

于 2016-04-29T19:42:04.103 回答