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我试图实现一个模型,该模型需要167个分类变量(0或1)的数组,并输出0和1之间的估计值。超过300个数据点可用。使用基本模型时,下面在sklearn/keras中使用cross_val_score时的负损失函数。当不使用k折叠
的样板工程:
classifier = Sequential()
classifier.add(Dense(units = 80, kernel_initializer = 'uniform', activation = 'relu', input_dim = 167))
classifier.add(Dense(units = 1, kernel_initializer = 'uniform', activation = 'sigmoid'))
classifier.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
classifier.fit(X_train, y_train, batch_size = 10, epochs = 200)
y_pred = classifier.predict(X_test)
输出类似于:
Epoch 105/200
253/253 [==============================] - 0s - loss: 0.5582 - acc: 0.0079
Epoch 106/200
253/253 [==============================] - 0s - loss: 0.5583 - acc: 0.0079
不幸的是,当我尝试使用交叉验证,模型停止工作,并损失功能变大而消极。代码如下:
def build_classifier():
classifier = Sequential()
classifier.add(Dense(units = 80, kernel_initializer = 'uniform', activation = 'relu', input_dim = 167))
classifier.add(Dense(units = 1, kernel_initializer = 'uniform', activation = 'sigmoid'))
classifier.compile(optimizer = 'adam', loss = 'binary_crossentropy', metrics = ['accuracy'])
return classifier
classifier = KerasClassifier(build_fn = build_classifier, batch_size = 10, epochs = 100)
accuracies = cross_val_score(estimator = classifier, X=X_train, y=y_train, cv=3,n_jobs=1)
输出的样子:
Epoch 59/100
168/168 [==============================] - 0s - loss: -1106.9519 - acc: 0.0060
Epoch 60/100
168/168 [==============================] - 0s - loss: -1106.9519 - acc: 0.0060
我有不同的参数玩弄,但我似乎无法找到是什么原因造成的问题。仍在学习,所以任何帮助都非常感谢。