java - 为什么 WEKA 评估类需要训练实例？

Question

我不明白为什么 Weka 评估类构造函数需要训练实例才能工作。

谁能解释一下？

理论上，评估仅取决于训练模型(下一个代码中的cls)和测试数据(TestingSet)。

谢谢!

这是一个例子:

// TrainingSet is the training Instances

// TestingSet is the testingInstances

// Build de classifier

Classifier cls = (Classifier) new NaiveBayes();

cls.buildClassifier(TrainingSet);

// Test the model

Evaluation eTest = new Evaluation(**TrainingSet**); 

eTest.evaluateModel(cls, TestingSet);

Answer 1

来自 UMass Boston Computer Science Documentation on Weka :

Evaluation public Evaluation(Instances data) throws java.lang.Exception

Initializes all the counters for the evaluation.
Parameters:
data - set of training instances, to get some header information and prior class distribution information
Throws:
java.lang.Exception - if the class is not defined

可以看看构造函数源码here .