混淆矩阵错误“列表”对象没有属性“argmax”

Question

我正在为DCNN模型编写分类报告，但我面临一个错误。我的代码是

from sklearn.metrics import confusion_matrix

test = ImageDataGenerator()
test_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1./255)
test_data = test_generator.flow_from_directory(directory="/content/dataset/test",target_size=IMAGE_SHAPE , color_mode="rgb" , class_mode='categorical' , batch_size=1 , shuffle = False )
test_data.reset()

predicted_class_indices=np.argmax(pred,axis=1)
cm = confusion_matrix(test_labels, predictions.argmax(axis=1))

错误：

AttributeError: 'list' object has no attribute 'argmax'

Answer 1

您的predictions显然是一个Python列表，并且列表没有argmax属性；您需要使用Numpy函数argmax()：

predictions = [[0.1, 0.9], [0.8, 0.2]] # dummy data
y_pred_binary = predictions.argmax(axis=1)
# AttributeError: 'list' object has no attribute 'argmax'

# Use Numpy:
import numpy as np
y_pred_binary = np.argmax(predictions, axis=1)
y_pred_binary
# array([1, 0])