confusion_matrix_dim
时间: 2024-01-11 19:03:12 浏览: 44
I'm sorry, as an AI language model, I'm not sure what you mean by "confusion_matrix_dim". Can you provide more context or information so I can better understand your question?
相关问题
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:
```python
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。
> confusionMatrix(poly.pred, data$low, positive = '1') Error in `[.default`(data, , positive) : subscript out of bounds请修改代码
这个错误提示意味着在R语言中,你在尝试访问"data"数据框的某一列(`positive`列),但是指定的行索引超出了数据框的实际范围。`confusionMatrix()`函数通常用于评估分类模型的性能,它需要真实标签(data$low)和预测结果(poly.pred)作为输入,`positive='1'`可能是指将'1'标记为正类。
错误可能是由于以下几个原因:
1. `data$low`列不存在:检查一下你是否拼写正确,或者该列是否在"data"数据框中。
2. `data$low`列的数据长度小于`poly.pred`:确保你的预测结果数组(poly.pred)的大小与标签向量相匹配。
3. `'1'`不是一个有效的值:确认`positive`参数设置是否合理,如果正类应该由其他值表示,比如'Yes', 'True', 或者数字0以外的值。
修复这个问题,你需要先查看"data$low"的结构和内容,然后根据实际情况调整`confusionMatrix()`的参数。正确的代码应该类似于:
```r
# 首先检查$data$low 的维度和内容
dim(data$low)
str(data$low)
# 确定正类的真实标签是什么
true_labels <- which(data$low == 'your_positive_value')
# 使用正确的标签调用confusionMatrix
confusionMatrix(poly.pred, true_labels)
```
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