def CNN_LSTM_model(input_size): model = Sequential() model.add(Conv1D(filters=64, kernel_size=3, activation='relu', input_shape=(input_size, 1))) model.add(Conv1D(filters=64, kernel_size=3, activation='relu')) model.add(MaxPooling1D(pool_size=2)) model.add(Dropout(0.5)) model.add(Conv1D(filters=128, kernel_size=3, activation='relu')) model.add(Conv1D(filters=128, kernel_size=3, activation='relu')) model.add(MaxPooling1D(pool_size=2)) model.add(Dropout(0.5)) model.add(Conv1D(filters=256, kernel_size=3, activation='relu')) model.add(Conv1D(filters=256, kernel_size=3, activation='relu')) model.add(MaxPooling1D(pool_size=2)) model.add(Dropout(0.5)) model.add(LSTM(64, return_sequences=True)) model.add(LSTM(32)) model.add(Dense(10, activation='relu')) model.add(Dense(1, activation='sigmoid')) return model改写成更适合5g异常流量数据分析的代码

可以考虑以下改进：

1. 修改模型输入形状，将原来的 `(input_size, 1)` 修改为 `(input_size, 3)`，表示每个时间步的输入特征包括当前时间步、前一时间步和后一时间步的流量数据。

2. 将最后一层的 `sigmoid` 激活函数改为 `softmax`，以便输出对不同类型异常流量的分类结果。

3. 修改模型输出层的神经元数量为 5，对应于可能的异常流量类型数目。

4. 修改损失函数为 `categorical_crossentropy`，适合多分类问题。

修改后的代码如下所示：

def CNN_LSTM_model(input_size):
    model = Sequential()
    model.add(Conv1D(filters=64, kernel_size=3, activation='relu', input_shape=(input_size, 3)))
    model.add(Conv1D(filters=64, kernel_size=3, activation='relu'))
    model.add(MaxPooling1D(pool_size=2))
    model.add(Dropout(0.5))
    model.add(Conv1D(filters=128, kernel_size=3, activation='relu'))
    model.add(Conv1D(filters=128, kernel_size=3, activation='relu'))
    model.add(MaxPooling1D(pool_size=2))
    model.add(Dropout(0.5))
    model.add(Conv1D(filters=256, kernel_size=3, activation='relu'))
    model.add(Conv1D(filters=256, kernel_size=3, activation='relu'))
    model.add(MaxPooling1D(pool_size=2))
    model.add(Dropout(0.5))
    model.add(LSTM(64, return_sequences=True))
    model.add(LSTM(32))
    model.add(Dense(10, activation='relu'))
    model.add(Dense(5, activation='softmax'))
    model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
    return model