Question

我在python中创建了一个能量函数，我将其应用于png图像。但是，当我输入参数时，我没有得到返回的能量值。谁能明白为什么会这样？谢谢！

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.image as mpimg

img=mpimg.imread('Image.png')
#plt.imshow(img)
#plt.show()

im=np.array(img


def E_generator(beta, eta, h):
    """Generate energy function E and localized version of E.
        E = h * \sum{x_i} - beta * \sum{x_i x_j} - eta * \sum{x_i y_i}
    """
    def E(x, y):
        """Calculate energy for matrices x, y.
        """
        # sum of products of neighboring paris {xi, yi}
        xxm = np.zeros_like(x)
        xxm[:-1, :] = x[1:, :]  # down
        xxm[1:, :] += x[:-1, :]  # up
        xxm[:, :-1] += x[:, 1:]  # right
        xxm[:, 1:] += x[:, :-1]  # left
        xx = np.sum(xxm * x)
        xy = np.sum(x * y)
        xsum = np.sum(x)
        return h * xsum - beta * xx - eta * xy

     return E

y = np.array(img)
x = np.array(y)

E_generator(0,1,1)

然后输出返回：＆＃34; .E＆gt;＆＃34;

Answer 1

你的函数E_generator返回一个函数（E）;要获得结果，您需要调用该函数，因此您可以执行以下操作：

print E_generator(0,1,1)(x, y)

能量函数不返回值

1 个答案: