multithreading - Python: threading + curve_fit: null argument to internal routine -


i have got problems using following code, supposed gaussian fits using threads:

      pil import image     import numpy np     scipy.optimize import curve_fit     import threading      class mythread (threading.thread):         def __init__(self, index):             threading.thread.__init__(self)             self.index = index         def run(self):             in np.arange(n_bild.shape[1]):                 curve_fit(self.gauss, x_x, intensitaet[self.index, ...], p0=(intensitaet[self.index, i], i, 1, 0))         def gauss(self, x, a, b, c, d):             return * np.exp(-(x-b) ** 2 / (2 * c ** 2)) + d      bild = image.open("test.bmp")     n_bild = np.asarray(bild)     intensitaet = np.zeros((n_bild.shape[0], n_bild.shape[1]), dtype=np.uint32)     intensitaet += n_bild[..., ..., 0]     intensitaet += n_bild[..., ..., 1]     intensitaet += n_bild[..., ..., 2]     x_x = np.arange(n_bild.shape[1]) #pixel auf "x"-achse      threads = []     # create new threads     thread0 = mythread(0)     thread1 = mythread(1)     # add threads thread list     threads.append(thread0)     threads.append(thread1)     # start new threads     thread0.start()     thread1.start()      # wait threads complete     t in threads:         t.join()     print "finished"

if run programm error:

 systemerror: null argument internal routine exception in thread thread-2: traceback (most recent call last):   file "c:\anaconda\lib\threading.py", line 808, in __bootstrap_inner     self.run()   file "g:/dropbox/daten/dropbox/uni/bachelorarbeit/python/threadtest.py", line 12, in run     curve_fit(self.gauss, x_x, intensitaet[self.index, ...], p0=(intensitaet[self.index, i], i, 1, 0))   file "c:\anaconda\lib\site-packages\scipy\optimize\minpack.py", line 533, in curve_fit     res = leastsq(func, p0, args=args, full_output=1, **kw)   file "c:\anaconda\lib\site-packages\scipy\optimize\minpack.py", line 378, in leastsq     gtol, maxfev, epsfcn, factor, diag) error: internal error constructing argument list.#

if run 1 thread instead of two, programm works fine, have no idea i'm doing wrong. help.

i believe leastsq() not threadsafe, , need either use threading.lock() around calls curve_fit() (which might defeat purpose) or use multiprocessing.


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