以下代码是对NSL-KDD数据集网络入侵检测：model = Sequential() model.add(LSTM(128, return_sequences=True, input_shape=(1, X_train.shape[2]))) model.add(Dropout(0.2)) model.add(LSTM(64, return_sequences=True)) model.add(Attention()) model.add(Flatten()) model.add(Dense(units=50)) model.add(Dense(units=5, activation='softmax')) # Defining loss function, optimizer, metrics and then compiling model model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy']) # Summary of model layers model.summary() # training the model on training dataset history = model.fit(X_train, y_train, epochs=150, batch_size=5000,validation_split=0.2) # predicting target attribute on testing dataset test_results = model.evaluate(X_test, y_test, verbose=1) # Use the trained model to make predictions on the test dataset y_pred = model.predict(X_test) # Convert predictions from one-hot encoding to integers y_pred = np.argmax(y_pred, axis=1) # Convert true labels from one-hot encoding to integers y_test = np.argmax(y_test, axis=1) # Calculate the confusion matrix cm = confusion_matrix(y_test, y_pred) # Calculate the false positive rate (FPR) fpr = cm[0, 1] / (cm[0, 0] + cm[0, 1])如何用代码实现对模型时间复杂度的计算

要计算模型的时间复杂度，需要先确定模型的计算量。可以使用Keras提供的model.count_params()方法来计算模型的总参数数量，然后根据LSTM和Attention层的计算复杂度（详见论文 "An Empirical Exploration of Recurrent Network Architectures"）来估算模型的计算量。

代码示例：

import keras.backend as K

def get_lstm_output_shape(layer, input_shape):
    # 计算LSTM层输出的形状
    if isinstance(layer.output_shape, list):
        return tuple(layer.output_shape[0][1:])
    else:
        return tuple(layer.output_shape[1:])

def get_lstm_params(layer, input_shape):
    # 计算LSTM层的参数数量
    if layer.use_bias:
        bias_multiplier = 3
    else:
        bias_multiplier = 2
    input_dim = input_shape[-1]
    units = layer.units
    return (input_dim*units + units**2)*bias_multiplier + units*4

def get_attention_params(layer, input_shape):
    # 计算Attention层的参数数量
    return 2*input_shape[-1]

def get_model_complexity(model, input_shape):
    # 计算模型的计算量
    total_params = model.count_params()
    total_flops = 0
    for layer in model.layers:
        if isinstance(layer, LSTM):
            output_shape = get_lstm_output_shape(layer, input_shape)
            params = get_lstm_params(layer, input_shape)
            flops = output_shape[0] * (params + output_shape[1] * 2)
            total_flops += flops
            input_shape = output_shape
        elif isinstance(layer, Attention):
            params = get_attention_params(layer, input_shape)
            flops = input_shape[0] * input_shape[1] * params
            total_flops += flops
        else:
            input_shape = layer.output_shape[1:]
    return total_params, total_flops

# 计算模型的计算量
total_params, total_flops = get_model_complexity(model, (1, X_train.shape[2]))
print("Total parameters:", total_params)
print("Total FLOPS:", total_flops)

其中，get_lstm_output_shape()函数用于计算LSTM层的输出形状，get_lstm_params()函数用于计算LSTM层的参数数量，get_attention_params()函数用于计算Attention层的参数数量，get_model_complexity()函数则用于计算整个模型的参数数量和计算量。最后，这段代码会输出模型的总参数数量和总计算量。