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| N=1000 | |
| hidden_0=50 | |
| hidden_1=500 | |
| contours= 21 | |
| for j in range(100): | |
| seed_=j | |
| print("Seed: " + str(j)) | |
| def costs(x,y,w_a,w_b): | |
| np.random.seed(seed_) | |
| w0=np.random.randn(hidden_0,784) | |
| w1= np.random.randn(hidden_1,hidden_0) | |
| w2=np.random.randn(10,hidden_1) | |
| w1[5][5] = w_a | |
| w1[5][6] = w_b | |
| a0 = expit(w0 @ x.T) | |
| a1= expit(w1@a0) | |
| pred= expit(w2 @ a1) | |
| return np.mean(np.sum((y.T-pred)**2,axis=0)) | |
| m1s = np.linspace(-15, 17, 25) | |
| m2s = np.linspace(-15, 18, 25) | |
| M1, M2 = np.meshgrid(m1s, m2s) | |
| zs = np.array([costs(X_train[0:N],y_train_oh[0:N] | |
| ,np.array([[mp1]]), np.array([[mp2]])) | |
| for mp1, mp2 in zip(np.ravel(M1), np.ravel(M2))]) | |
| Z = zs.reshape(M1.shape) | |
| fig = plt.figure(figsize=(10,10)) | |
| ax = fig.add_subplot(111,projection='3d' ) | |
| ax.view_init(elev=40, azim=220) | |
| ax.plot_surface(M1, M2, Z, cmap='terrain', #surface plot | |
| antialiased=True,cstride=1,rstride=1, alpha=0.69) | |
| plt.tight_layout() | |
| plt.show() |
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