运行下面一段代码：
import numpy as npimport matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3D#这里设函数为y=3x+2x_data = [1.0,2.0,3.0]y_data = [5.0,8.0,11.0]def forward(x):return x * w + bdef loss(x,y):y_pred = forward(x)return (y_pred-y)*(y_pred-y)mse_list = []W=np.arange(0.0,4.1,0.1)B=np.arange(0.0,4.1,0.1)[w,b]=np.meshgrid(W,B)l_sum = 0for x_val, y_val in zip(x_data, y_data):y_pred_val = forward(x_val)print(y_pred_val)loss_val = loss(x_val, y_val)l_sum += loss_valfig = plt.figure()ax = Axes3D(fig)ax.plot_surface(w, b, l_sum/3)plt.show(block=True)
可能出现的结果是：（版本问题导致）
解决办法：
添加一条代码：
fig.add_axes(ax)全部完整代码如下：
import numpy as npimport matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3D#这里设函数为y=3x+2x_data = [1.0,2.0,3.0]y_data = [5.0,8.0,11.0]def forward(x):return x * w + bdef loss(x,y):y_pred = forward(x)return (y_pred-y)*(y_pred-y)mse_list = []W=np.arange(0.0,4.1,0.1)B=np.arange(0.0,4.1,0.1)[w,b]=np.meshgrid(W,B)l_sum = 0for x_val, y_val in zip(x_data, y_data):y_pred_val = forward(x_val)print(y_pred_val)loss_val = loss(x_val, y_val)l_sum += loss_valfig = plt.figure()ax = Axes3D(fig)fig.add_axes(ax)ax.plot_surface(w, b, l_sum/3)plt.show(block=True)
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