Scipy Minimize使用NoneType

Question

我正在尝试编写一个多元线性回归。下面是我的程序引发错误的代码行：

least = optimize.minimize(residsq(xmat, ylist, coeff), coeff, constraints = ({'type': 'eq', 'fun': sum(resid(xmat, ylist, coeff))}), method = 'BFGS') # Choose the coefficients that minimize the sum of the residuals squared subject to keeping the sum of the residuals equal to 0.

xmat是一个向量列表：[3,5,2,3,1,6,7,2,3，9，-2,0]。ylist是与xmat相同长度的列表: 5,2,7,7。coeff是系数列表，最初是mean(ylist), 0, 0, 0。resid是每个点的残差列表，residsq是残差的N2范数(平方和的sqrt)。

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    import linregtest
  File "C:\Python33\lib\site-packages\linregtest.py", line 4, in <module>
    out = linreg.multilinreg(xmat, ylist, True)
  File "C:\Python33\lib\site-packages\linreg.py", line 120, in multilinreg
    least = optimize.minimize(residsq(xmat, ylist, coeff), coeff, constraints = ({'type': 'eq', 'fun': sum(resid(xmat, ylist, coeff))}), method = 'BFGS') # Choose the coefficients that minimize the sum of the residuals squared subject to keeping the sum of the residuals equal to 0.
  File "C:\Python33\lib\site-packages\scipy\optimize\_minimize.py", line 302, in minimize
    RuntimeWarning)
  File "C:\Python33\lib\idlelib\PyShell.py", line 60, in idle_showwarning
    file.write(warnings.formatwarning(message, category, filename,
AttributeError: 'NoneType' object has no attribute 'write'

文件从何而来，如何抑制此错误？

编辑:解决一个问题，找到另一个问题。也许你能帮我确定SciPy在哪里调用了一个浮点？

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    import linregtest
  File "C:\Python33\lib\site-packages\linregtest.py", line 4, in <module>
    out = linreg.multilinreg(xmat, ylist, True)
  File "C:\Python33\lib\site-packages\linreg.py", line 123, in multilinreg
    least = optimize.minimize(residsq(xmat, ylist, coeff), coeff, constraints = ({'type': 'eq', 'fun': sumresid(xmat, ylist, coeff)}), method = 'SLSQP') # Choose the coefficients that minimize the sum of the residuals squared subject to keeping the sum of the residuals equal to 0.
  File "C:\Python33\lib\site-packages\scipy\optimize\_minimize.py", line 364, in minimize
    constraints, **options)
  File "C:\Python33\lib\site-packages\scipy\optimize\slsqp.py", line 301, in _minimize_slsqp
    meq = sum(map(len, [atleast_1d(c['fun'](x, *c['args'])) for c in cons['eq']]))
  File "C:\Python33\lib\site-packages\scipy\optimize\slsqp.py", line 301, in <listcomp>
    meq = sum(map(len, [atleast_1d(c['fun'](x, *c['args'])) for c in cons['eq']]))
TypeError: 'float' object is not callable

Answer 1

我刚刚编辑了我的Python3.2IDLE，PyShell.py (修复了59和62行)

def idle_showwarning(message, category, filename, lineno,
                     file=None, line=None):
    if file is None:
        file = sys.stderr #warning_stream
    try:
        file.write(warnings.formatwarning(message, category, filename,
                                          lineno, line=line))

使用sys.stderr而不是使用sys.__stderr__的全局warning_stream。在我的例子中，sys.__stderr__是None。我不知道为什么要使用全局变量。

对warnings.formatwarning的调用包含额外的无效file关键字。

现在，我打印出警告，例如

>>> import numpy as np
>>> np.uint(1) - np.uint(2)

Warning (from warnings module):
  File "C:\Programs\Python32\Lib\idlelib\idle.pyw", line 1
    try:
RuntimeWarning: overflow encountered in ulong_scalars
>>> 4294967295
>>> 

编辑：

搜索python错误报告

http://bugs.python.org/issue12438错误的file参数已修复

sys.__stderr__ is None的http://bugs.python.org/issue13582问题尚未解决