import numpy as np import matplotlib.pyplot as plt # 生成sin函数数据 x = np.arange(0, 2*np.pi, 0.1) y = np.sin(x) # 可视化sin函数 plt.plot(x, y) plt.show() from keras.models import Sequential from keras.layers import Dense, SimpleRNN # 准备数据 dataX, dataY = [], [] for i in range(len(y)-1): dataX.append(y[i:i+1]) dataY.append(y[i+1]) dataX = np.array(dataX) dataY = np.array(dataY) # 划分训练集和测试集 train_size = int(len(dataY) * 0.7) test_size = len(dataY) - train_size trainX, testX = np.array(dataX[0:train_size]), np.array(dataX[train_size:len(dataX)]) trainY, testY = np.array(dataY[0:train_size]), np.array(dataY[train_size:len(dataY)]) # 调整输入数据的形状 trainX = np.reshape(trainX, (trainX.shape[0], 1, trainX.shape[1])) testX = np.reshape(testX, (testX.shape[0], 1, testX.shape[1])) # 定义模型结构 model = Sequential() model.add(SimpleRNN(units=10, input_shape=(1, 1))) model.add(Dense(units=1)) # 编译模型 model.compile(optimizer='adam', loss='mse') # 训练模型 history = model.fit(trainX, trainY, epochs=1000, validation_data=(testX, testY)) # 可视化损失函数 plt.plot(history.history['loss']) plt.plot(history.history['val_loss']) plt.title('Model Loss') plt.ylabel('Loss') plt.xlabel('Epoch') plt.legend(['Train', 'Test'], loc='upper right') plt.show()梯度可视化代码
时间: 2024-03-10 17:50:29 浏览: 52
import numpy as np import matplotlib.pyplot as plt import math
这段代码并没有进行梯度可视化,需要添加相关的代码才能进行梯度可视化。以下是使用keras-vis库进行梯度可视化的示例代码:
```python
from keras.models import Model
from vis.visualization import visualize_saliency
from vis.visualization import visualize_cam
from vis.visualization import visualize_activation
from vis.utils import utils
import matplotlib.pyplot as plt
# 获取模型中间层的名称
layer_names = [layer.name for layer in model.layers]
# 选择要可视化的层
layer_idx = utils.find_layer_idx(model, 'simple_rnn')
# 定义输入和输出张量
input_tensor = model.input
output_tensor = model.layers[layer_idx].output
# 构建用于可视化的新模型
visualization_model = Model(input_tensor, output_tensor)
# 可视化梯度
grads = visualize_saliency(visualization_model, layer_idx, filter_indices=None, seed_input=trainX[0], backprop_modifier='guided')
plt.imshow(grads)
plt.show()
# 可视化类激活热力图
heatmap = visualize_cam(visualization_model, layer_idx, filter_indices=None, seed_input=trainX[0], backprop_modifier='guided')
plt.imshow(heatmap)
plt.show()
# 可视化中间层激活
activation = visualize_activation(visualization_model, layer_idx, filter_indices=None, seed_input=trainX[0])
plt.imshow(activation)
plt.show()
```
其中,`visualize_saliency`函数用于可视化梯度,`visualize_cam`函数用于可视化类激活热力图,`visualize_activation`函数用于可视化中间层激活。可以根据需要选择使用不同的函数进行可视化。
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