原書ch3 在 github 中的 3.5-classifying-movie-reviews.ipynb 中執行到：
import matplotlib.pyplot as plt
acc = history.history['acc']
val_acc = history.history['val_acc']
時會遇到兩個：
KeyError: 'acc'
KeyError: 'val_acc'
需修改爲：
acc = history.history['binary_accuracy']
val_acc = history.history['val_binary_accuracy']
原書ch3 在 github 中的 3.5-classifying-movie-reviews.ipynb 中執行到：
import matplotlib.pyplot as plt
acc = history.history['acc']
val_acc = history.history['val_acc']
時會遇到兩個：
KeyError: 'acc'
KeyError: 'val_acc'
需修改爲：
acc = history.history['binary_accuracy']
val_acc = history.history['val_binary_accuracy']