#x = tf.expand_dims(model_input,axis = 1) #x = Dense(32)(model_input) #x1 = Dense(32)(model_input) #x2 = Dense(32)(model_input) #x = Concatenate(axis=2)((x,x1,x2)) x = LSTM(32,return_sequences=True)(model_input) #x = LSTM(32,return_sequences=True)(x) x = LSTM(32,return_sequences=False)(x) x = Dropout(0.2)(x) y1 = Dense(16,name='EG')(x) y1 = Dense(1,name='EG1')(y1)
时间: 2023-11-24 21:07:06 浏览: 92
这段代码是在定义一个循环神经网络模型(LSTM),其中 `model_input` 是输入层的输出。具体来说,代码首先使用 LSTM 层对输入进行处理,其中 `return_sequences=True` 表示 LSTM 层的输出也是一个序列。然后,代码再次使用 LSTM 层对上一层的输出进行处理,其中 `return_sequences=False` 表示 LSTM 层只返回最后一个输出。接着,代码使用一个 Dropout 层对输出进行正则化处理。最后,代码定义了一个输出层 y1,其中 `Dense(16,name='EG')` 表示该层输出 16 个神经元,且命名为 'EG',而 `Dense(1,name='EG1')` 表示该层只有一个输出神经元,并且命名为 'EG1'。
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请将此代码修改为tensorflow2.7,cuda11.2版本的代码 import tensorflow as tf from tensorflow import keras from tensorflow.keras.datasets import mnist from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Conv2D, MaxPooling2D, Flatten, Dense, ReLU from tensorflow.keras.utils import to_categorical # 加载MNIST数据集 (x_train, y_train), (x_test, y_test) = mnist.load_data() # 数据预处理 x_train = x_train.astype("float32") / 255.0 x_test = x_test.astype("float32") / 255.0 x_train = tf.expand_dims(x_train, axis=3) x_test = tf.expand_dims(x_test, axis=3) y_train = to_categorical(y_train, num_classes=10) y_test = to_categorical(y_test, num_classes=10) # 构建LeNet-5模型 model = Sequential([ Conv2D(6, kernel_size=3, strides=1), MaxPooling2D(pool_size=2, strides=2), ReLU(), Conv2D(16, kernel_size=3, strides=1), MaxPooling2D(pool_size=2, strides=2), ReLU(), Flatten(), Dense(units=120, activation='relu'), Dense(units=84, activation='relu'), Dense(units=10, activation='softmax') ]) # 编译模型 model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy']) # 训练模型 model.fit(x_train, y_train, batch_size=128, epochs=30, validation_data=(x_test, y_test)) # 在测试集上输出精度 test_loss, test_acc = model.evaluate(x_test, y_test) print('Test accuracy:', test_acc)
这是一个类似的 TensorFlow 2.7 和 CUDA 11.2 版本的代码示例:
```python
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras.datasets import mnist
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Conv2D, MaxPooling2D, Flatten, Dense, ReLU
from tensorflow.keras.utils import to_categorical
# Set GPU device
gpus = tf.config.experimental.list_physical_devices('GPU')
if gpus:
try:
tf.config.experimental.set_visible_devices(gpus[0], 'GPU')
tf.config.experimental.set_memory_growth(gpus[0], True)
print("Using GPU:", tf.test.gpu_device_name())
except RuntimeError as e:
print(e)
# Load MNIST dataset
(x_train, y_train), (x_test, y_test) = mnist.load_data()
# Preprocess data
x_train = x_train.astype("float32") / 255.0
x_test = x_test.astype("float32") / 255.0
x_train = tf.expand_dims(x_train, axis=3)
x_test = tf.expand_dims(x_test, axis=3)
y_train = to_categorical(y_train, num_classes=10)
y_test = to_categorical(y_test, num_classes=10)
# Define LeNet-5 model
model = Sequential([
Conv2D(6, kernel_size=3, strides=1),
MaxPooling2D(pool_size=2, strides=2),
ReLU(),
Conv2D(16, kernel_size=3, strides=1),
MaxPooling2D(pool_size=2, strides=2),
ReLU(),
Flatten(),
Dense(units=120, activation='relu'),
Dense(units=84, activation='relu'),
Dense(units=10, activation='softmax')
])
# Compile model
model.compile(optimizer='adam',
loss='categorical_crossentropy',
metrics=['accuracy'])
# Train model
model.fit(x_train, y_train, batch_size=128, epochs=30, validation_data=(x_test, y_test))
# Evaluate model on test set
test_loss, test_acc = model.evaluate(x_test, y_test)
print('Test accuracy:', test_acc)
```
这个代码实现了一个 LeNet-5 模型,用于识别 MNIST 手写数字。它使用了 TensorFlow 2.7 和 CUDA 11.2 版本,并且在 GPU 上训练模型。在代码中,我们首先检查是否有可用的 GPU 设备,并设置 TensorFlow 只使用第一个 GPU 设备。然后,我们加载 MNIST 数据集并对其进行预处理。接下来,我们定义了一个包含两个卷积层和三个全连接层的 LeNet-5 模型,并使用 Adam 优化器和交叉熵损失函数编译了模型。最后,我们在训练集上训练模型,并在测试集上评估模型的准确性。
origin_input = Input(shape=(time_step, features)) # 模型输入 time_step*(N+1),N为分解所得分量数 cominput = origin_input[:, :, 1:] # 分解所得分量构成的序列 time_step*N output = concatenate( [Conv1D(kernel_size=3, filters=64, activation='relu', padding='same')(tf.expand_dims(cominput[:, :, ts], axis=-1)) for ts in range(features-1)], axis=-1) output = Dense(64, activation='relu')(output) # 拼接所得结果经全连接层进行降维&转换 res = Conv1D(kernel_size=1, filters=64, activation='relu')(tf.expand_dims(origin_input[:, :, 0], axis=-1)) output = concatenate((output, res), axis=-1) output = Bidirectional(GRU(64, return_sequences=True))(output) output = Bidirectional(GRU(64, return_sequences=True))(output) time_last = tf.transpose(output, [0, 2, 1]) att_1 = Dense(time_step, activation='tanh')(time_last) att_2 = Dense(time_step, activation='softmax', use_bias=False)(att_1) time_att = Multiply()([time_last, att_2]) out = tf.reduce_sum(time_att, axis=-1) output = Dense(1, activation='sigmoid')(out) model = Model(inputs=origin_input, outputs=output, name='proposed_model') opt = tf.keras.optimizers.Adam(learning_rate=0.001) model.compile(loss=losses.mse, optimizer=opt) model.summary() lr_reducer = ReduceLROnPlateau(factor=0.5, patience=5) callbacks = [lr_reducer] model.fit(x_train_scaled, y_train_scaled, epochs=100, batch_size=512, validation_split=0.1, callbacks=callbacks)
这段代码是一个使用 Keras 搭建的神经网络模型,用于进行时间序列数据的预测。该模型使用了卷积神经网络和双向 GRU 神经网络对输入的时间序列数据进行处理和特征提取,然后使用全连接层和注意力机制等结构将处理后的特征进行汇总和加权,最终输出一个标量值作为预测结果。在训练过程中,该模型使用了均方误差作为损失函数,使用 Adam 优化器进行参数优化,并使用 ReduceLROnPlateau 回调函数自动调整学习率,以提高模型的精度和稳定性。
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