python 生成GIF动图

python openCV

网上找的code

def gradient_descent(X_b, y, initial_theta, eta, n_iters=1e4, epsilon=1e-8):
    theta = initial_theta
    i_iter = 0
    xb = (np.array(X_b)[:, 1])
    while i_iter < n_iters:
        plt.ion()
        gradient = dJ(theta, X_b, y)
        last_theta = theta
        theta = theta - eta * gradient
        #while (i_iter % 1000) == 1:
        while (i_iter < 150) & ((i_iter % 5) == 1):
            print(i_iter)
            xq = [0, 2]
            yq = theta[0] * np.array(xq) + theta[1] * np.ones(np.shape(theta))
            fig = plt.figure()
            fig = plt.scatter((np.array(X_b)[:, 1]), y)
            fig = plt.plot(xq, yq, linewidth=4, color='darkgoldenrod')
            fig = plt.legend(['data', 'simulate'], loc='upper left')
            fig = plt.title('gradient')
            fig = plt.xlabel(i_iter)
            plt.savefig(r"C:\\Users\\xiaoy\\Pictures\\s\\" + format(i_iter+100) +
                        '.png')
            plt.show()
            print(theta)
            plt.close()
            i_iter = i_iter + 1 
        if (abs(J(theta, X_b, y) - J(last_theta, X_b, y)) < epsilon):
            break
        i_iter = i_iter + 1
    return theta
theta = gradient_descent(X_b, y, initial_theta, eta)
print("荣耀不朽")