使用ImageDataGenerator使用model.predict获取预测值-keras 2.1.0（深度学习）

Question

我正在尝试获取所有正确和不正确的预测值（我要预测图像类别）

所以，我的代码是：

#Load the trained model
loaded_model= tf.keras.models.load_model('C:/Desktop/data/model.h5')

#ImageDataGenerator for reading data from directory
test_generator = ImageDataGenerator().flow_from_directory(
    'C:/Desktop/data/test',
    target_size=(img_width, img_height),
    batch_size=batch,
    class_mode='categorical')

#Predicting the classes of images
predictions = loaded_model.predict(test_generator)
print('predictions shape:', predictions.shape)
print('predictions:', predictions)

predictions.shape的输出为(568, 2)，predictions的输出为：

[[4.5327284e-11 1.0000000e+00]
 [1.0000000e+00 3.6808674e-11]
 [1.3124708e-03 9.9868757e-01]
 ...
 [1.0000000e+00 2.0863072e-11]
 [9.3747419e-01 6.2525854e-02]
 [1.0000000e+00 4.2702163e-14]]

但是我需要获得可用于混淆矩阵的数据之类的预测

所以我需要具有以下值：

24 predictions for class 1 was correct
 5 predictions for class 1 was incorrect
 1 prediction for class 0 was correct
 7 predictions for class 0 was incorrect

编辑：

我正在尝试使用tutorial中的代码，但出现错误：

AttributeError: 'DirectoryIterator' object has no attribute 'class_indicies'

现在我的代码：

test_generator = ImageDataGenerator().flow_from_directory(
        'C:/Desktop/data/test',
        target_size=(img_width, img_height),
        batch_size=batch,
        class_mode='categorical',
        shuffle=False)

predictions = loaded_model.predict(test_generator, steps=test_generator.batch_size, verbose=1)
predicted_class_indices = np.argmax(predictions, axis=1)
print('predictions: ', predicted_class_indices)

labels = test_generator.class_indicies #here I am getting an error
labels = dict((v,k) for k,v in labels.items())
predictionss = [labels[k] for k in predicted_class_indices]
print(predictionss)

Answer 1

根据您的形状，我假设您有2个班级。

#Load the trained model
loaded_model= tf.keras.models.load_model('C:/Desktop/data/model.h5')

#ImageDataGenerator for reading data from directory
test_generator = ImageDataGenerator().flow_from_directory(
    'C:/Desktop/data/test',
    target_size=(img_width, img_height),
    batch_size=batch,
    class_mode='categorical')

#Predicting the classes of images
predictions = loaded_model.predict_generator(test_generator)
print('predictions shape:', predictions.shape)
print('predictions:', predictions)

# getting the labels

pred_labels = list(np.argmax(predictions, axis=-1))

# getting true labels
true_labels = test_generator.classes

# get the confusion plot

cm = sklearn.metrics.confusion_matrix(true_labels, pred_labels)