如何使用Tensorflow显示CNN上使用的卷积滤波器？

import tensorflow as tf
import matplotlib.pyplot as plt

model = tf.keras.applications.VGG16(weights='imagenet', include_top=False)

conv_layers = [layer for layer in model.layers if isinstance(layer, tf.keras.layers.Conv2D)]

for i, layer in enumerate(conv_layers):
    filters, biases = layer.get_weights()
    plt.figure(figsize=(10, 10))
    for j in range(filters.shape[3]):
        plt.subplot(4, 4, j+1)
        plt.imshow(filters[:, :, 0, j], cmap='gray')  # 显示第一个通道的滤波器
        plt.axis('off')
    plt.suptitle('Convolutional Filters - Layer {}'.format(i+1))
    plt.show()