使用其他Cython代码中的自定义Cython代码

我目前正在尝试优化我的Python程序，并开始使用Cython，以减少函数调用的开销，也许以后还包括优化的C库函数.

I am currently trying to optimize my Python program and got started with Cython in order to reduce the function calling overhead and perhaps later on include optimized C-libraries functions.

所以我遇到了第一个问题:

So I ran into the first problem:

我在代码中使用组合来创建一个更大的类.到目前为止，我已经将我的Python类之一转换为Cython(这很困难).这是代码:

I am using composition in my code to create a larger class. So far I have gotten one of my Python classes converted to Cython (which was difficult enough). Here's the code:

import numpy as np
cimport numpy as np
ctypedef np.float64_t dtype_t
ctypedef np.complex128_t cplxtype_t
ctypedef Py_ssize_t index_t

cdef class bendingForcesClass(object):
    cdef dtype_t bendingRigidity
    cdef np.ndarray matrixPrefactor
    cdef np.ndarray bendingForces

    def __init__(self, dtype_t bendingRigidity, np.ndarray[dtype_t, ndim=2] waveNumbersNorm):
        self.bendingRigidity = bendingRigidity
        self.matrixPrefactor = -self.bendingRigidity * waveNumbersNorm ** 2

    cpdef np.ndarray calculate(self, np.ndarray membraneHeight):
        cdef np.ndarray bendingForces
        bendingForces = self.matrixPrefactor * membraneHeight
        return bendingForces

在我的Python/Cython组合类中，我调用类方法calculate，因此在组合类中，我具有以下(简化的)代码:

From my composed Python/Cython class I am calling the class-method calculate, so that in my composed class I have the following (reduced) code:

from bendingForcesClass import bendingForcesClass

cdef class membraneClass(object):
    def  __init__(self, systemSideLength, lowerCutoffLength, bendingRigidity):
        self.bendingForces = bendingForcesClass(bendingRigidity, self.waveNumbers.norm)

    def calculateForces(self, heightR):
        return self.bendingForces.calculate(heightR)

我发现cpdef使方法/函数可以从Python和Cython调用，这很好并且可以工作，只要我不尝试预先定义self.bendingForces的类型-根据文档(提早绑定).我已经尝试了以下方法，但不起作用:

I have found out that cpdef makes the method/functions callable from Python and Cython, which is great and works, as long as I don't try to define the type of self.bendingForces beforehand - which according to the documentation (Early Binding For Speed) is necessary in order to remove the function-calling overhead. I have tried the following, which does not work:

from bendingForcesClass import bendingForcesClass
from bendingForcesClass cimport bendingForcesClass

    cdef class membraneClass(object):
        cdef bendingForcesClass bendingForces

        def  __init__(self, systemSideLength, lowerCutoffLength, bendingRigidity):
            self.bendingForces = bendingForcesClass(bendingRigidity, self.waveNumbers.norm)

        def calculateForces(self, heightR):
            return self.bendingForces.calculate(heightR)

与此有关，当我尝试使用Cython构建membraneClass.pyx时，出现此错误:

With this I get this error, when trying to build membraneClass.pyx with Cython:

membraneClass.pyx:18:6: 'bendingForcesClass' is not a type identifier
building 'membraneClass' extension

请注意，声明位于两个单独的文件中，这使此操作更加困难.

Note that the declarations are in two separate files, which makes this more difficult.

那么我该如何完成呢?如果有人能给我一个指针，我将非常感激，因为除了上面给出的链接之外，我找不到关于此的任何信息.

So I how do I get this done? I would be very thankful if someone could give me a pointer, as I can't find any information about this, besides the link given above.

感谢和问候！