在 Windows 10 上使用 cnn keras 进行花卉识别

Question

在我与机器学习相关的项目中，使用 CNN keras 进行花卉识别..显示以下错误 错误：

 Anaconda3\lib\site-packages\keras\callbacks\callbacks.py:846: RuntimeWarning: Early stopping conditioned on metric `val_acc` which is not available. Available metrics are: val_loss,val_accuracy,loss,accuracy
  (self.monitor, ','.join(list(logs.keys()))), RuntimeWarning

关于代码：

#using Grid Search and Early stopping
es = EarlyStopping(monitor='val_acc', verbose=2, patience=25)
mc = ModelCheckpoint('./best_model_1.h5', monitor='val_acc', verbose=2, save_best_only=True)

Hyp_Model_1 = KerasClassifier(build_fn=Revised_1_fn)
#You need to pick the right hyper-parameters for your training (try with different ones)

learn_rate = [0.01]
batch_size = [32,75,100]
epochs = [5]

param_grid = dict(batch_size=batch_size, epochs=epochs, learn_rate = learn_rate)
randSearch_1 = GridSearchCV(estimator = Hyp_Model_1, param_grid=param_grid, cv=5)

new_grid_1 = randSearch_1.fit(X_train,y_train, validation_data = (X_val, y_val), verbose=2,callbacks=[es,mc])

Answer 1

正如错误消息中所暗示的，Keras 不将val_acc 识别为度量；您需要输入可用选项中列出的val_accuracy。