python - 名称错误 : name 'history' is not defined

Question

设置模型，为实验设置训练和验证数据，模型训练已经执行。但是在训练神经网络之后，在可视化训练过程中，我收到了一个错误。

import matplotlib.pyplot as plt
%matplotlib inline

acc=history.history['categorical_accuracy']
val_acc=history.history['val_categorical_accuracy']
loss=history.history['loss']
val_loss=history.history['val_loss']

epochs=range(1,len(acc)+1)
plt.xlabel('Epochs')
plt.ylabel('Accuracy')
plt.plot(epochs, acc, 'bo', label='Training acc')
plt.plot(epochs, val_acc, 'b', label='Validation acc')
plt.title('Training and validation accuracy')
plt.legend()
plt.figure()

plt.plot(epochs, loss, 'bo', label='Training loss')
plt.plot(epochs, val_loss, 'b', label='Validation loss')
plt.title('Training and validation loss')
plt.xlabel('Epochs')
plt.ylabel('Loss')
plt.legend()
plt.show()

NameError                                 Traceback (most recent call last)
<ipython-input-7-e1591c31f061> in <module>()
      2 get_ipython().magic('matplotlib inline')
      3 
----> 4 acc=history.history['categorical_accuracy']
      5 val_acc=history.history['val_categorical_accuracy']
      6 loss=history.history['loss']

NameError: name 'history' is not defined

Answer 1

当你调用 model.fit 时，它应该是

history = model.fit()