执行下面代码段,对其输出结果描述正确的是_______。 import tensorflow as tf mnist = tf.keras.d
A、training set:(60000,) testing set:10000
B、training set: (60000, 28, 28) testing set: 10000
C、training set:(10000, 28, 28) testing set: 60000
D、training set:(10000,) testing set: 60000